Answers
0.4g of Hydrogen will be produced when 4.6g of Sodium is used to provide Sodium Hydroxide.
The balanced equation for the formation of Sodium Hydroxide is given below:
2Na + 2H₂O ------> 2NaOH + H₂
It is shown that 2 moles of Na produce 2moles of Hydrogen. We know that the atomic mass of Sodium is 23g/mol. Then the number of moles present in 4.6g of Sodium would be,
Moles of Sodium = 4.6/23
Moles of Sodium = 0.2mol
Therefore,4.6g of Sodium has 0.2mol. Therefore, then 0.2 mol of sodium reacts to give out 0.2 mol of Hydrogen gas
The mass of hydrogen gas could be computed by the product of the mass of hydrogen gas and moles of hydrogen which is given by,
Mass of 2 atoms of hydrogen = 2x1x0.2
Mass of 2 atoms of hydrogen= 0.4g
Therefore, for every 0.2mol of Sodium, 0.1 mol of Hydrogen is produced which is equal to 0.4g of Hydrogen.
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Related Questions
summarize how the VSEPR model helps explain how electric charges affect bonding and molecular shape in covalent compounds
Answers
The VSEPR model helps in explain how electric charges affect bonding and molecular shape in covalent compounds as -
The form of many molecules and polyatomic ions can be predicted using the valence-shell electron-pair repulsion (VSEPR) model, which is pronounced "vesper." However, keep in mind that the VSEPR model, like any model, is only a partial description of reality; it doesn't reveal bond lengths or the existence of numerous bonds.
The structures of many compounds and polyatomic ions with a central metal atom can also be predicted by the VSEPR model, as can the structures of practically any molecule or polyatomic ion with a central nonmetal atom. The foundation of the VSEPR theory is the idea that electron pairs in bonds and lone pairs reject one another and would, as a result, adopt a geometry that spreads them as far apart as feasible. The three-dimensional structures of many compounds, which cannot be predicted using the Lewis electron-pair approach, can be predicted using the straightforward VSEPR counting procedure, despite the fact that this theory is oversimplified and does not take into account the subtleties of orbital interactions that influence molecular shapes.
By concentrating only on the number of electron pairs surrounding the central atom and disregarding any other valence electrons present, the VSEPR model can be used to predict the geometry of the majority of polyatomic compounds and ions. This model states that valence electrons in the Lewis structure form groups that can be made up of a single bond, a double bond, a triple bond, a lone pair of electrons, or even a single unpaired electron, which is treated as a lone pair in the VSEPR model. Electrostatic repulsion causes electrons to repel one another; hence, the arrangement of electron groups that minimises repulsions is the most stable (lowest energy). The arrangement of groups around the centre atom creates the molecular structure with the lowest energy
The molecule or polyatomic ion is designated by the letters AXmEn in the VSEPR model, where A stands for the centre atom, X for a bonding atom, E for a nonbonding valence electron group (often a lone pair of electrons), and m and n are integers. The designation of each group surrounding the centre atom as a bonding pair (BP) or lone (nonbonding) pair (LP). Both the relative locations of the atoms and the bond angles—also known as bond angles—can be predicted from the BP and LP interactions. We may characterise the molecular geometry—the configuration of the bound atoms in a molecule or polyatomic ion—using this knowledge.
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As per the VSEPR model, the lone pair present in a compound causes bending in the molecular geometry of the covalent compounds.
What is molecular geometry?
Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.
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a person has a mass of 70.0kg on earth, what would their mass be on the moon, which has 1/6 the graving of earth?
Answers
The mass equivalent of the individual on the moon would be = 11.67kg.
What is mass?Mass is defined as the scalar quantity that is used to determine the amount of matter within an object. It is measured in Kilograms or grams.
The mass of gravity is defined as the gravitational pull that occurs with the mass of objects towards the center of the earth.
In earth, the mass of gravity is represented as = 1
In moon the mass of gravity = 1/6
To determine the mass of gravity of the same object in moon would be;
= 1/6 × 70
= 11.67kg
Therefore, in the moon, the mass of 70kg man would be = 11.67kg.
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Step 3: Apply the scaling factor to the
empirical formula.
The scale factor is 5 and the empirical
formula is CH2O. What is the molecular
formula?
C?H?O?
Answers
The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.
Considering the question given above, the following data were obtained:
Empirical formula = CH₂O
Molar mass of compound = 150 g/mol
Scaling factor (n) =?
Empirical formula × n = molar mass
[CH₂O]n = 150
[12 + (2×1) + 16]n = 150
[12 + 2 + 16]n = 150
30n = 150
Divide both sides by 30
n = 5
Therefore, the scaling factor is 5
A scale factor is a ratio between corresponding measurements of an object and a representation of that object.In chemistry, the empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound. .Learn more about empirical formula at:
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How many moles of Cl atoms are in a 75.0 ml. sample of
CCM (d:1.6 g/cm?, C. 12, CE36)
Answers
The number moles of Cl atoms in a 75.0 mL sample of CCl₄ is 3.12 mol.
The data is given is as follows :
volume = 75.0 mL
density = 1.6 g/cm³ = 1.6 g/mL
Density = mass / volume
mass = density × volume
= 1.6 × 75
= 120 g
moles of CCl₄ = mass / molar mass
= 120 / 153.82
= 0.780 mol
1 mole of CCl₄ = 4 mole of Cl
moles of Cl = 4 × 0.780
= 3.12 mol
Thus, The number moles of Cl atoms in a 75.0 mL sample of CCl₄ is 3.12 mol.
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why sodium is not stored in water but stored in kerosene oil?
Answers
Answer:
Because it is a highly reactive group 1 metal and would react with the water, but not with oil.
How would these questions be answered based on the pictures provided?
Answers
- Top picture = Beryllium-7
- Bottom picture = Beryllium-8
Note: Both are Beryllium, but are isotopes.
General steps ( can be used on similar questions):
I. Count the # of protons in the atom.
II. Go to the periodic table and look for atomic #, which is equal to # of protons in an atom.
III. Count the # of neutrons.
IV. # of neutrons + # of protons = mass number. (the number after the hyphen)
2)
Top picture:
- Atomic # = 4
- p = 4
- e = 4
- n = 3
- mass = 1.17*10^-23 g
Bottom picture:
- Atomic # = 4
- p = 4
- e = 4
- n = 4
- mass = 1.33*10^-23g
General steps to find atomic #, p, n, and e:
I. Count the # of protons in the atom to get p.
II. Go to the periodic table and look for atomic #, which is equal to # of protons in an atom.
III. Count the # of electrons to get e.
IV. Count the # of neutrons to get n.
General steps to calculate mass:
I. Find the molar mass of the element on the periodic table. Or, do a web search.
II. Multiply molar mass with 6.02*10^23 (Avogadro’s Number)
III. Cancel out any units and solve.
In the pictures are the steps I used to calculate the mass for your particular problem.
4. In a binary power system the secondary fluid that turns into vapor to drive the turbine
has a
a. lower boiling point
b. higher boiling point
5. What does an Enhanced Geothermal System (EGS) increase the risk of?
Answers
In a binary power system the secondary fluid that turns into vapor to drive the turbine has a lower boiling point
Binary cycles power plant operate on water at lower temprature of about 225-360°F and binary cycles plant use the heat from hot water to boil a working fluid and usually an organic compound with low boiling point and the working fluid is vaporized in a heat exchanger and used to turn a turbine and heat from geothermal fluid causes the secondary fluid to flash to vapor and which then drives the turbines and subsequently the generator
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Calculate the mass of succinic anhydride needed to be 1.0 mol % relative to 1.0 mL of 2-hydroxyethyl methacrylate.
Answers
Answer:
mL of 2-hydroxyethyl methacrylate. 5) Calculate the mass of maleic anhydride needed to be 1.0 mol % relative to 1.0 mL of 2-hydroxyethyl methacrylate.
Explanation:
The mass of succinic anhydride needed to be 1.0 mole % relative to 1.0 mL of 2-hydroxyethyl methacrylate is 4.5 x 10⁻⁵ moles.
What is mass?Mass is defined as the quantity of material that makes up a thing, whereas weight is the force that an object produces. A majority of an atom's mass is contained in its nucleus. For discussions of how atoms interact with one another and consequently for chemistry, biology, and electronics, the surrounding electrons are of course essential. But they only contribute a tiny fraction of the total mass.
The number of moles of 2-hydroxyethyl methacrylate in 1ml
= 1 / 22410 = 4.46 x 10⁻⁵ moles
The mole percent need to be 1
Let the moles of succinic anhydride be X
Therefore
1 / 100 = X / X + 4.46 x 10⁻⁵
X + 4.46 x 10⁻⁵ = 100 x
99 X = 4.46 x 10⁻⁵
X = 4.46 x 10⁻⁵ / 99
X = 4.5 x 10⁻⁷ moles
The mass of succinic anhydride
= X x molar mass
= 4.5 x 10⁻⁷ x 100
= 4.5 x 10⁻⁵ moles
Thus, the mass of succinic anhydride needed to be 1.0 mole % relative to 1.0 mL of 2-hydroxyethyl methacrylate is 4.5 x 10⁻⁵ moles.
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which gaseous agent is a mixture of carbon and one or more elements from the halogen series (fluorine, chlorine, bromine, or iodine)?
Answers
Halon is a gaseous agent which contains a mixture of carbon and one or more elements from the halogen series.
Halons are from the group of halocarbons. Halons are substances made of bromine, fluorine, and carbon. Extinguishers and other firefighting apparatus use them. Halons are electrically nonconducting substances that can be used to put out fires in flammable liquids and most solid combustible materials, including those found in electrical equipment. They are ineffective against fires caused by fuels that contain their own oxidizing agent or by highly reactive metals like sodium or potassium.
Halon 1301, also known as bromotrifluoromethane, is particularly preferred for putting out fires involving electronic equipment because it leaves no residue, doesn't result in electrical short connections, and won't harm the device's corrosion.
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One of the most harmful organic substance to nature is
a. DNA
b. RNA
c. Amino acid
d. CFC
Answers
one of the most harmful organic substance to nature is
d. CFC
One of the most harmful organic substance to nature is CFC. Chemicals with carbon, chlorine, and fluorine atoms are known as chlorofluorocarbons (CFCs) , and they are neither poisonous nor combustible.
What is CFC ?Chlorofluorocarbons and hydrochlorofluorocarbons are formed as volatile derivatives of methane, ethane, and propane. They are completely or partially halogenated hydrocarbons that include carbon, hydrogen, chlorine, and fluorine.
They are employed as solvents, refrigerants, blowing agents for foams and packaging materials, and in the production of aerosol sprays. Freon, a brand name owned by DuPont, is another name for them.
Chlorofluorocarbons (CFCs) are a class of artificially produced, odorless compounds. CFCs have been prohibited since 1996 due to the harm they do to the ozone layer of the earth. The biodiversity of the world itself will suffer if the ozone layer is destroyed.
Thus, option D is correct.
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Some natural and synthetic materials are made of long repeating units. What are these best referred to as?
O Links (left) and chains (right)
O Molecules (left) and macromolecules (right)
O Solutes (left) and solutions (right)
O Monomer (left) and polymer (right)
Answers
Long repeating units are used to create several natural and manmade materials. they most appropriately referred to as O Links and chains (left) and O Molecules (right)? (left).
What is the name for a long sequence of repeated units?A molecule comprised of repeating units is referred to as a polymer. These "monomers" combine to form a lengthy molecular chain. It could be made up of branches or it might just be one continuous line of identically related molecules.
Name the worker macromolecule in the cell and describe one of its functions.A polymer or macromolecule made of many amino acids, proteins are. The monomers/building blocks of a protein are amino acids. things? There are numerous varieties of proteins, which are the supporting molecules of the cell,
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A solution that has a high concentration of hydrogen ions has what type of pH?
2
7
13
14
worth 100 points **URGENT**
Answers
Answer:
High concentration of ions means that the solution is very acidic. These types of solutions have a pH < 7.0, so a very low pH.
Therefore, the answer that most closely matches the criteria would be 2.
For the given reaction, what volume of O₂ would be required to react with 6.2 L of NO, measured at the same temperature and
pressure?
2 NO(g) + O₂(g) → 2 NO₂(g)
Answers
O2 would need to react in 3.1 L of volume.
Given data:-2NO(g) + O2(g) ==> Equation that is balanced: 2NO2(g)
We can observe that 2 moles of NO react with 1 mole of O2 using this equation. We can also state that 2 liters of NO and 1 liter of O2 react under conditions of constant pressure and temperature. The amount of O2 required to react with 4.8 L of NO can then be calculated as follows:
6.2 L NO multiplied by 1 L O2 divided by 2 L NO results in a need for 3.1 L of O2.
2NO O2 2NO2: What kind of reaction is that?values for the reaction 2NO + O2 = 2NO2 in terms of kinetics and rate constants. It is generally known that this reaction is a third-order homogeneous reaction.
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How does alternate freezing and thawing of water cause weathering to occur?
A Water expands when it freezes and cracks rocks open Water expands when it freezes and cracks rocks open
B Thawing causes rock particles to move from place to place Thawing causes rock particles to move from place to place
C Freezing chemically alters the rock surfaces
Answers
Freezing leads to weathering because water expands when it freezes and cracks rocks open Water expands when it freezes and cracks rocks open
What is weathering?The term weathering has to do with the process of the breakdown of the rocks to give rise to the soil. Now there are are various ways in which the process of weathering could be able to take place. One of the ways that the process of weathering can take place is what we call physical weathering.
In the process of physical weathering, we are looking at some kind of physical pressure which would lead to the breakdown of the rock. This is what makes it different from the chemical and the mechanical forms of weathering.
Thus, the fact that water would expand when we freeze it would mount pressure on the rock and then cause it to weather and form soil.
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3) Consider the ideal gas equation, PV = nRT. Rearrange to solve for P (show your work below).
Recall that the equation of a line is y = mx + b. In that case, plotting y vs x gives you a slope
of m and an intercept of b. Now look at your equation that you solved for P. If you plot P vs
1/V, what should the slope be? What should the intercept be?
Answers
The slope of the line would be m = nRT.
How to prove this answer?
We know that the ideal gas law is PV = nRT.
We know that y = mx + b. In that case, plotting y vs x gives you a slope
of m and an intercept of b.
Here according to the question, If we send V to RHS,
P= (1/V) nRT Where y axis is P and 1/V is y axis, nRT would be the ultimate slope.
Howerver, intercept c ( y=mx+c) would be 0 as we considered ideal situation with temperature , R constant.
Therefore, Slope would be nRT.
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Which part of Earth experiences physical weathering? (1 point)
O crust
O mantle
O inner core
O outer core
0
A
O
Answers
do pockets of liquid water form when a salt solution (like sodium chloride or magnesium sulfate)evaporates
Answers
Liquid water form when a salt solution (like sodium chloride or magnesium sulfate)evaporates so only water can evaporates
Saline solution is also called as salt solution it is the mixture of salt and water and normal saline solution contain 0.9 percent sodium chloride and which is similar to the sodium concentration in blood and tear and the water molecule that evaporate become a gas called water vapor and only the water evaporated and leaving the sodium and chloride ion behind and sodium and chloride ion attract each other and reform salt crystals
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What's the coefficient in 4Ca(OH)2 ?
Answers
Answer: Molecular Weight of 4Ca(OH)2 is 296.3707 g/mol
Explanation The molar mass and molecular weight of 4Ca(OH)2 is 296.371.
Practical work
1. What is the mass of a solution of sulfuric acid with a mass fraction of it in the solution of 96%
spent on dissolving copper scrap weighing 12.8 g, which contained 0.5 parts by mass of copper?
2. What volume of ammonia can be obtained by treating ammonium chloride weighing 12 g with a solution
sodium hydroxide, which contains 8 g of it.
3. What is the practical yield of gas, if 4 liters of it were obtained by the thermal decomposition of potassium nitrate
weighing 40.4 g?
4. What is the practical yield of the sediment, if 6.5 g of it was filtered after
addition of 15 g of barium hydroxide solution with a mass fraction of 40% to orthophosphate acid
weighing 5 g.
5. How will the rate of the reaction that takes place in the gas phase change when it decreases
temperature by 30°C, if the temperature rate coefficient for this reaction is equal to 3.
6. The reaction of the decomposition of phosphorus pentachloride proceeds according to the equation:
PCl 5 (g) ↔ PCl 3 (g) + Сl 2 (g) – 92 kJ. How to change: a) temperature; b) pressure; in)
the concentration of reactants to shift the equilibrium of the reaction towards the decomposition of PCl 5 (to the right).
Answers
Answer:
What is the mole fraction of sulfuric acid in a solution containing 98% sulfuric by mass?
What is the mole fraction of H2SO4 in a 98% aqueous H2SO4 solution?
Here given..
98 % of H2SO4 that means 98 g of H2SO4 is there in 100 g of aq. H2SO4 solution.
So.
Mass of solute = 98 g
Mass of solvent = 2 g (as water is considered as universal solvent)
Molar mass of solute = 98 g
Molar mass of solvent = 18 g
No of moles of solute = 1 mole (no of moles = given mass / molar mass)
No of moles of solvent = 2/18 = 1/9 moles
And ,
We know formula for mole fraction is..
x( of solute) = Moles of solute/(moles of solute + moles of solvent)
x (of solute) = 1/(1+(1/9)) = 0.9
x (of solvent) = 1 - 0.9 = 0.1
Explanation:
it is just number 1
Explain your understanding: Use your own words and captured images from the simulation to show you can:
i. Define “isotope” using mass number, atomic number, and neutrons
Please please please help and harry
Answers
Isotopes have the same atomic number but a different atomic mass. Isotopes of an element carry a different number of neutrons.
What is an isotope?Isotopes can be described as atoms of an element that have the same atomic number but a different mass number. Isotopes of an element contain the same number of electrons and protons as the actual element. but the number of neutrons are different in their respective nucleus.
For example, the isotopes of oxygen element are oxygen-16, oxygen-17, and oxygen-18 they all have 8 electrons or protons. As the number of neutrons in oxygen increases by one, it forms a new isotope of oxygen.
As for the isotope, the number of electrons in the isotope of any element is the same. Therefore, isotopes of any element carry the same atomic number but a different mass number.
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Using the same sample of gas ( P1 = 735 torr , T1 = 6 ∘C ), we wish to change the pressure to 7350 torr with no accompanying change in volume or amount of gas. What temperature T2 , in Celsius, is needed to reach this pressure?
Express your answer with the appropriate units.
Answers
The temperature T₂, in Celsius, that is needed to reach the pressure of 7350 torr is 2517 °C
How do I determine the temperature T₂?From the question given above, the following data were obtained:
Initial pressure (P₁) = 735 torr Initial temperature (T₁) = 6 °C = 6 + 273 = 279 KVolume = ConstantNew pressure (P₂) = 7350 torrNew temperature (T₂) =?Since the volume isconstant, we can determine the new temperature, T₂ as illustrated below:
P₁ / T₁ = P₂ / T₂
735 / 279 = 7350 / T₂
Cross multiply
735 × T₂ = 279 × 7350
Divide both side by 735
T₂ = (279 × 7350) / 735
T₂ = 2790 K
Subtract 273 to obtain answer in °C
T₂ = 2790 – 273 K
T₂ = 2517 °C
Thus, the temperature T₂ is 2517 °C
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Compute the following blood alcohol levels and classify as not impaired or impaired:
0.003 grams of alcohol in a 15 ml sample of blood
0.006 grams of alcohol in a 5 ml sample of blood
0.01 grams of alcohol in a 12 ml sample of blood
0.006 grams of alcohol in a 20 ml sample of blood
Answers
Based on the blood alcohol concentration values:
a. 0.003 grams of alcohol in a 15 ml sample of blood is classified as not impaired
b. 0.006 grams of alcohol in a 5 ml sample of blood is classified as impaired
c. 0.01 grams of alcohol in a 12 ml sample of blood is classified as impaired
d. 0.006 grams of alcohol in a 20 ml sample of blood is classified as not impaired
What is the blood alcohol concentration, BAC?The blood alcohol concentration is the amount of alcohol present in a given volume of blood.
Blood alcohol concentration is used to measure intoxication in individuals.
When blood alcohol concentration increases, impairment increases in individuals.
The benchmark level of impairment or non-impairment is 0.08%.
Calculating the blood alcohol concentration for the given situations:
a. 0.003 grams of alcohol in a 15 ml sample of blood
BAC level = 0.003/15 * 100%
BAC level = 0.02%
b. 0.006 grams of alcohol in a 5 ml sample of blood
BAC level = 0.006/5 * 100
BAC level = 0.12%
c. 0.01 grams of alcohol in a 12 ml sample of blood
BAC level = 0.01/12 * 100
BAC level = 0.083%
d. 0.006 grams of alcohol in a 20 ml sample of blood
BAC level = 0.006/20 * 100
BAC level = 0.03%
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Is 2.27x10-3 M acidic, basic or neutral
Answers
Answer:
acidic
Explanation:
As concentration is given we can find out pH using -log(concentration)
So input, -log(2.27X10^-3) and it gives us 2.644 (appx.)
according to the pH chart, pH value lesser than 7 refer to acidic substances. pH value 7 means neutral and pH value higher than 7 means basic. As 2.644 is less than 7, so it is acidic.
which of the following statements about the combustion of glucose with oxygen to form water and carbon dioxide (c6h12o6 6 o2 → 6 co2 6 h2o) is correct?
a. The entropy of the products is greater than the entropy of the reactants.
b. The reverse reaction, making glucose from water and carbon dioxide, must be an exergonic reaction.
c. This is the process of cellular respiration, an anabolic pathway that releases free energy.
d. The entropy of the universe decreases as the result of this reaction.
e. The free energy lost in this combustion is less than the energy that appears as heat.
Answers
The correct statement about the combustion of glucose with oxygen to form water and carbon dioxide is The entropy of the products is greater than the entropy of the reactants.
A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant.
A familiar example of a combustion reaction is a lighted match. When a match is struck along the match box, friction heats the head of the match to a temperature at which the chemicals react and then generate more heat which can escape into the air, and they burn with a flame after reacting with the oxygen.
In the above given question we can see that when combustion reaction of glucose takes place we can see that it produces water and along with that we can also see that carbon dioxide gas is also been released. In the reactant side we can see that there are no gaseous molecules present but we can see that in the product side there are gaseous molecules present, which suggests that randomness of the system is increased.
Hence the entropy of the products would be greater than the reactants.
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The following statements about the combustion of glucose with oxygen to form water and carbon dioxide is the entropy of the product is greater than the entropy of the the reactants.
The combustion reaction is given as :
C₆H₁₂O₆ + 6O₂ ----> 6CO₂ + 6H₂O
The large molecule that is glucose is converted into the small small molecules water and the carbon dioxide. this is the reason the entropy of the product side is greater than the entropy ( the disorder )of the reactants .
Thus, The following statements about the combustion of glucose with oxygen to form water and carbon dioxide is the entropy of the product is greater than the entropy of the the reactants.
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In the chemical reaction, calcium carbonate (CaCO3) was heated to form two new substances: calclum
oxide (Cao) and carbon dioxide (CO₂).
CaCO3 → CaO + COz
A student heated 24.8 g of CaCO3. After the reaction, they measured 13.9 g of Cao.
What was the mass of the CO₂ gas that escaped during the reaction?
A.10.9 g
B. 38.7 g
C.1.78 g
D.24.8 g
Answers
Chemical species are broken down into more basic components in decomposition processes. Energy input is often required for decomposition reactions. The mass of the CO2 gas that escaped = 10.99 g.
What is a decomposition reaction?
Chemical species are broken down into more basic components in decomposition processes. Energy input is often required for decomposition reactions.
A decomposition reaction occurs when one reactant disintegrates into two or more products. The following general equation represents this: AB A + B. Both the decomposition of water into hydrogen and oxygen and the breakdown of hydrogen peroxide into water and oxygen are examples of decomposition reactions.
A decomposition reaction occurs when one reactant disintegrates into two or more products. It is represented by the all-inclusive formula AB A + B. A and B are the reaction products in this equation, while AB stands for the reactant that starts the reaction.
Molecular mass of CaO = 56.07 g
CO = 44.01 g
the mass of the CO2 gas that escaped = 13.9 x 44.01/ 56.07
= 10.99 g.
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A container of iron (III) carbonate contains 4.15 x 10^26 carbon atoms. How much does this sample of iron(III) carbonate weigh?
Answers
A container of iron (III) carbonate contains 4.15 x 10^26 carbon atoms. this sample of iron(III) carbonate weigh is 2.0 × 10⁵ g
iron(III) carbonate , number of atoms = 4.15 × 10²⁶ atoms
Avogadro's number = 6.022 × 10²³
moles of iron(III) carbonate = number of atoms / Avogadro's number
= 4.15 × 10²⁶ / 6.022 × 10²³
= 6.89 × 10² mol
mass of iron(III) carbonate = moles × molar mass
= 6.89 × 10² × 291.7
= 2.0 × 10⁵ g
Thus, A container of iron (III) carbonate contains 4.15 x 10^26 carbon atoms. this sample of iron(III) carbonate weigh is 2.0 × 10⁵ g
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Given the thermochemical equations
X₂ + 3 Y₂ → 2XY3 ΔH1= -340kJ
X₂ + 2Z₂ → 2XZ₂ ΔH2= -170 kJ
2Y2 + Z2 → 2Y₂Z ΔH3= -260 kJ
Calculate the change in enthalpy for the reaction.
4XY3 +7Z₂ → 6Y₂Z + 4 XZ₂
ΔH= ____ kJ
Answers
The change in enthalpy for the reaction is ∆H = - 440 kJ
This Enthalpy equals the sum of the system's internal energy with the constant. You must understand that energy forms change, but Enthalpy remains constant. For example, when water freezes into ice, some energy is expended in doing the work, which is referred to as Enthalpy.
Given that:
(1) X2 + 3Y2⟶ 2XY3 Δ1=−340 kJ
(2) X2 + 2Z2⟶ 2XZ2 Δ2=−170 kJ
(3) 2Y2 + Z2⟶ 2Y2Z Δ3=−260 kJ
We have to calculate the change in enthalpy for 4XY3 + 7Z2 → 6Y2Z + 4XZ2
The enthalpy of the reverse reaction is lower than that of the forward one.
Hess law: It states that the heat of reaction for any specific reaction is equal to the sum of the heat of each reaction that sums up to the overall reaction.
The required equation 4XY3 + 7Z2 → 6Y2Z + 4XZ2 is obtained by
-2(equation1) + 2(equation 2) + 3 (equation 3)
Reversing equation(1) we get
2(XY3 → X2 + 3Y2) + 2 (X2 + 2Z2 ⟶ 2XZ2 )+ 3 (2Y2 + Z2⟶ 2Y2Z)
4XY3 + 2X2 + 4Z2 + 6Y2 + 3Z2 ⟶ 2X2 + 6Y2 + 4XZ2 + 6Y2Z
Canceling all the standard terms we get
4XY3 + 7Z2 ==> 4XZ2 + 6Y2Z
Hence the required equation is obtained
Thus the change in enthalpy of the required reaction is
2〖(∆H〗_rev) +2〖(∆H〗_2)+ 3〖(∆H〗_3)
∆H = 2〖(∆H〗_rev) +2〖(∆H〗_2)+ 3〖(∆H〗_3)
∆H = 2(340) + 2(-170) +3 (-260) = -350 kJ
∆H = 680 – 340 – 780
∆H = - 440 kJ
Therefore the change in enthalpy for the reaction is ∆H = - 440 kJ
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An element is located in group 11 on the periodic table. Would this element be a metal, nonmetal, or metalloid?
Answers
The periodic table's metal group 11, which includes sodium, is where you may find this element.
What is metal?When newly prepared, polished, or shattered, a metal exhibits a shiny look and quite good electrical and thermal conductivity. Typically, metals are malleable and ductile. The metallic link formed by the atoms and molecules of a metal gives rise to these characteristics. Any of the many glossy, opaque, fusible, ductile materials that really are good conductors of heat and electricity, make cations by the loss of electrons, and produce basic oxides & hydroxides. in particular: one that belongs to a chemical substance as opposed to an alloy.
What are the examples of metal and its types?Lead, aluminum, copper, zinc, and brass are a few examples. According to the periodic table, metals can be categorized according to their atomic structure. Alkaline, transitional, or alkaline earth metals are several types of metal. Any of a group of materials known as metals that exhibit strong thermal and electrical conductivity as well as malleability, ductility, and high light reflection.
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Considering the redox reaction Cr + Ni²+ → Cr³+ + Ni, how many
electrons are transferred in the balanced reaction?
Answers
In the redox reaction Cr + Ni²+ → Cr³+ + Ni, the electrons are transferred in the balanced reaction is 3 electrons.
In this given reaction,
Cr → Cr³+ + 3e-
Ni²+ + 2e- → Ni
+_____________
Cr + Ni²+ → Cr³+ + Ni
In the redox reaction, determine the lowest common multiple of the number of electrons gained in the reduction and lost in the oxidation. In redox reaction, a type of chemical reaction that involves a transfer of electrons between two species.
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Which of the following is a reasonable ground-state electron configuration?
O 1s21p5
O1s22s22p8
O 1s22s22d4
O 1s?2s22p6
Answers
Answer:
the last one (if we consider the typo ? as 2)
Explanation:
p orbital can hold 6 electrons
1st orbit only has 's' orbital
2nd orbit only has 's' & 'p' orbital, no 'd' orbital