Based on the given relative atomic masses of the isotopes, the mass of Na-22 contained in this sample is 0.086 g.
What is the relative atomic mass of an element?The relative atomic mass of an element is the average mass of one mole of an atom of an element calculated from the atomic masses of the atoms of an element and their relative abundances.
relative atomic mass of an element = sum of atomic mass * relative abundance of each isotope.Isotopes of elements are atoms of an element that differ from each other by their masses. The difference in the mass of the isotopes is a result of the difference in the number of neutrons contained within the nucleus of the atoms of the isotopes.
Considering the naturally occurring sodium isotope, Na-23, and the synthetic, radioactive isotope of sodium, Na-22:
the relative atomic mass of Na-23 = 22.9898 u
the relative atomic mass of Na-22 = 21.9944 u.
mass of sample = 2.4698 g
the apparent atomic mass of the isotope = 22.9551 u
Sum of the relative abundances = 1
Let relative abundance of Na-22 = x
relative abundance of Na-22 = 1 - x
22.9898 * (1 - x) + 21.9944 * x = 22.9551
22.9898 - 22.9898x + 21.9944x = 22.9551
0.9954x = 0.0347
x = 0.035
Mass of Na-22 in the sample = 2.4698 * 0.035
Mass of Na-22 in the sample = 0.086 g
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X If I want to measure the mass of a fly in metrics, What should I use
If want to measure the mass of a fly in metrics use a scale or a balance.
What is the most used metric system?The current international standard metric system and the one that is most generally used worldwide is the International System of Units (Système international d'unités, or SI). It is a development of Giorgi's MKSA system, with the meter, kilogram, second, ampere, kelvin, candela, and mole as its fundamental units.
What tool should you use to measure mass?A balance is used to estimate an object's mass for the majority of commonplace objects. The balance compares the target object to a known mass object. Digital scientific balances and beam balances, like a triple beam balance, are examples of several sorts of balances.
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How is related the calorific capacity of a substance with its temperature?
The calorific capacity of a substance related to the temperature when specific heat of a substance ∆Q changes.
What is specific heat?Specific heat is defined as the heat required to raise the temperature of 1 gram of a substance by one degree.
Specific heat = q/(∆T × mass of the substance)
What is Heat capacity?Heat Capacity is defined as the amount of heat required to raise the temperature of the system by one degree.
Units of heat capacity :
The unit of heat capacity are joule/kelvin or joule/Celsius.
Heat capacity at constant volume = dU/dTHeat capacity at constant pressure = dH/dTThus, we concluded that the calorific capacity of a substance related to the temperature when specific heat of a substance ∆Q changes.
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In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
Answer
(A) H3PO4
(B) H₂SO4
(C) HCIO3
(D) H₂O
Answer:
B is the answer
Explanation:
H2SO4 contains:
2H
1S
4O
4 is double of 2
Help me PLEEEEEAAASSEE ASAP I BEG YOU IF YOU KNOW THE ANSWER Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Measured over twenty years methane is eighty times more powerful than carbon dioxide and causes global warming, while nitrous oxide is 280 times more powerful. During the industrial age, carbon dioxide caused about 10 times more warming than nitrous oxide. But laughing gas is stronger. One pound of gas heats the atmosphere about 300 times more than one pound of carbon in 100 years.
Water vapor is the most powerful greenhouse gas in the Earth's atmosphere and plays a unique role among them. The amount of water vapor in the atmosphere is usually not directly changed by human actions. It depends on the air temperature. Compared to other anthropogenic greenhouse gases, carbon dioxide CO2 has the largest relative contribution to the increase in the greenhouse effect.
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Where are non metals located in the periodic table?
Answer: Right Side
Explanation: The nonmetals or non-metals are a group of elements located on the right side of the periodic table (except for hydrogen, which is on the top left).
Answer: non-metals are on the right side of the periodic table. They are located to the right of the line (usually appears as a dark latter). Note that hydrogen is not located there but it is also a non-metal.
The line N is at a wavelength of 590 nm. Calculate the frequency of this light in Hertz
Answer:
5.08 x 10¹⁴ Hz
Explanation:
To find the frequency, you need to use the following equation:
f = c / λ
In this equation,
-----> f = frequency (Hz)
-----> c = speed of light (3.00 x 10⁸ m/s)
-----> λ = wavelength (m)
After converting the wavelength from nm to m, you can plug the given values into the equation and solve for "f".
590 nm 1 m
---------------- x ------------------------ = 5.90 x 10⁻⁷ m
1 x 10⁹ nm
f = c / λ <----- Given equation
f = (3.00 x 10⁸ m/s) / (5.90 x 10⁻⁷ m) <----- Insert values
f = 5.08 x 10¹⁴ Hz <----- Divide
Plsss I need it urgently
From the particles shown, the ones that will have a stronger attraction to each other are those in water H₂O. This is because water has a boiling point of 100°C while that of CO₂ is -78.5. Hence, while both are covalently bonded, the bonds in water are stronger.
What is a Covalent Bond?It is to be noted that a covalent bond is formed between two atoms by the mutual use of one or more pairs of electrons. The two atomic nuclei attract these electrons at the same time. When the difference in electronegativities of two atoms is too tiny for electron transfer to produce ions, a covalent bond occurs.
The word "covalent bond" first appeared in 1939. The prefix co- denotes jointly, related in action, paired to a lesser degree, etc.; hence, a "co-valent bond" in essence indicates that the atoms share "valence," as defined in valence bond theory.
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Which is the formula for calculating the mass number of an atom?
A protons + neutrons
B quarks + protons
C protons + electrons
D neutrons + electrons
Answer:
A: protons + neutrons
Explanation:
protons and neutrons both have the same mass. Their mass is much greater than the mass of an electron so it is deemed negligible
Based on the diagram, describe the relationship between the deer population and biodiversity in forest c
Not adversely but deer population do effects the biodiversity in a way that plant diversity specifically get reduced.
What is biodiversity and how deer population effects the biodiversity?Biodiversity refers to the population of all plants and animals living on the earth along with other species.Now deer population is a bane and a boon both to the natural ecosystem, to the diverse unification of species on Earth.Deer in the forest eat the plants that tastes good and leave the ones that do not , even if it is the product or leaves of the same plants.This led to trouble in colonial growth of plants again , which reduces plants in that area.And deer population in every possible forest suffers this issue and collectively it accounts for a big biodiversity reduction.To know more about biodiversity visit:
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Which of the following statements does not describe the structure of an atom? The electron cloud is a small and compacted space around the nucleus? The electron cloud is a small and compacted space around the nucleus? Protons are positively charged sub-atomic particles? Or Electrons are negatively charged subatomic particles?
Atoms are made up of protons and neutrons in the center, with electrons circling in orbitals outside the nucleus.
As a result, option c is the right answer.
What is an atom's structure?A complicated collection of electrons with negative charges grouped in specified shells around a positive-charged nucleus is an atom. This nucleus, which is made up of protons and neutrons, holds the majority of the atom's mass (except for common hydrogen which has only one proton). Every atom is nearly the same size.
The electron is a specific location where an electrons is most likely to be found. We can't see where an electrons is, but we can utilize its wave equation to calculate the likelihood that it is in a specific place.
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Helpppp
Use the reaction below to solve this problem.
The Rf value is used to produce a final confirmation of the identify of a substance.
True or False
The Rf value is used to produce a final confirmation of the identify of a substance its true sentence
In thin-layer chromatography, the retention factor Rf is used to compare and help identify compounds and the Rf value of a compound is equal to the distance traveled by the compound divided by the distance traveled by the solvent front both measured from the origin and Rf values are used to determine polarity, relative masses, and relative solubility's, among other things
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4. A balloon filled with 2 L of air is at 313 K. Suppose the temperature increases to 600 K. Calculatewhat happens to the volume of the balloon.
According to Charle's law, a balloon at 600 K has a volume of 3.83 L.
Describe Charles's law.Charles' law states that, under constant pressure, the volume a given amount of gas fills is directly proportional to its absolute temperature. For instance, when the temperature drops during the winter, a basketball placed outside in the ground would contract.
Mathematically, Charles' law can be written as V1/T1 = V2/T2, where V1 denotes the volume at the beginning, T1 the temperature at that point, and V2 the volume at the end with T2 the temperature at that point.
The following examples of how Charles' law is applied in real life:
Helium balloons shrink when it's cold outside.
From Charles' law, V/T = constant
V₁/T₁ = V₂/T₂
or, 2/313 = V₂/600
or, V₂ = (2x600)/313
= 3.83
Hence, form Charles' law we conclude the volume of balloon at 600 K is 3.83 L.
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The combustion of propane may be described by the chemical equation
C₂H₂(g) +50₂(g) → 3 CO₂(g) + 4H₂O(g)
How many grams of O₂(g) are needed to completely burn 27.6 g C₂H, (g)?
137.6 grams of oxygen are needed to completely burn 27.6 grams of C₂H₂ during the combustion of propane in the equation.
What is combustion?Combustion is the reaction of a substance with oxygen with a deliberate amount of heat and light release.There are several kinds of combustion rapid combustion, spontaneous combustion, and Explosive also.The molar mass of C₂H₂ = 32 g
Molar mass of oxygen = 32 g
Therefore, the moles of propane is given as
27.6/ 32
=0.86 moles
Usually 1 equivalent of C₂H₂ will consume 5 equivalent of oxygen. So, 0.86 moles will consume
0.86 × 5
= 4.3
So, moles of oxygen will be
4.3 × 32
= 137.6 g
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Determine the quantity in moles of RbF that are in 57.0 grams of RbF.
The quantity of moles in 57.0grams of RbF is 0.545mol.
How to calculate number of moles?Moles is the base unit of amount of substance i.e. the amount of substance of a system which contains exactly 6.022 × 10²³ elementary entities (atoms, ions, molecules, etc.).
The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
No of moles = mass ÷ molar mass
Molar mass of RbF = 85.467 + 18.998 = 104.5g/mol
moles = 57.0g ÷ 104.5g/mol = 0.545mol
Therefore, 0.545moles is the quantity of moles of RbF in 57.0grams of the compound.
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. What is the molar mass of sulfuric acid, (H2SO4), a substance frequently used to commit horrific violent crimes against women? Show your work.
You are running a genetics experiment. Which of the following will help you obtain the copies of the gene you need?
A. Plasmid
B. Ribosome
C. Nucleus
D. Mesosome
Plasmids help you obtain the copies of the gene you need.
What are plasmids?In contrast to a cell's chromosomal DNA, plasmids are tiny, circular, double-stranded DNA molecules.Plasmids, which are found in a wide range of microorganisms, most notably bacteria, are small, extra-chromosomal circular DNA molecules that can replicate on their own without the assistance of the host.Plasmids naturally exist in bacterial cells and certain eukaryotes as well.Plasmid genes frequently give bacteria genetic advantages, such as antibiotic resistance.Bacteria and certain other tiny creatures have little, circular DNA molecules called plasmids.Chromosomal DNA is physically distinct from plasmids, which multiply autonomously.To learn more about plasmids, refer
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The drawing shows Earth's revolution around the Sun.
Based on the drawing, what season are students in Florida experiencing when Earth is at position 1?
According to the image, it can be inferred that the students in Florida are in summer when the earth is in position 1.
What relationship does the movement of the earth have with the seasons?The seasons are a term that refers to each of the periods of time in which the year is divided, with a duration greater than the months, characterized by the typical behavior of some meteorological variable. They occur cyclically and inverted between one hemisphere and another.
In general, the seasons are divided in this way:
Position 1: June 21 - September 23
Boreal Summer
I invest Austral
Position 2: September 23 - December 21
boreal autumn
southern spring
Position 3: December 21 - March 21
boreal winter
Ausral Summer
Position 4: March 21 - June 21
boreal spring
southern autumn
According to the above, it can be inferred that in position 1 the students from Florida will be in the summer season because Florida is in the boreal hemisphere of the earth (Northern hemisphere).
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Hydrochloric acid reacts with zinc, giving zinc chloride and hydrogen.Also,hydrochloric acid in concentrated aqueous solution undergoes electrolysis (with electrodes inert).
Define:
a) the mass in grams of the product in the cathode, if there are 0.5 mol/100 ml of HCl in the solution;
b) boiling under normal conditions of the gas obtained in the anode, if the pH of the acid is 2;
c) the mass in grams of the metal obtained in the cathode (electrolyzed glass), if the salt of zinc is formed by the interaction of 3.65 g of hydrochloric acid with zinc.
Hydrochloric acid reacts with zinc, giving Hydrogen gas and zinc chloride.
What occurs to zinc when zinc and hydrochloric acid interact?An aqueous solution of hydrogen chloride is hydrochloric acid, often called muriatic acid. It is a colorless solution with an overpowering odor.Hydrogen gas and zinc chloride are quickly formed when zinc and hydrochloric acid interact.Zinc metal displaces the hydrogen in a single displacement process to produce zinc chloride and hydrogen gas. Because the related reaction is exothermic, a significant amount of heat is produced: ZnCl2(aq) + H2 + Zn (s) + 2HCl (g)
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Upon combustion, a 0.8009 g
g
sample of a compound containing only carbon, hydrogen, and oxygen produces 1.6004 g
g
CO2
C
O
2
and 0.6551 g
g
H2O
H
2
O
. Find the empirical formula of the compound.
The empirical formula of the compound is mathematically given as
C2H4O
This is further explained below.
What is the empirical formula?Generally, The empirical formula of a chemical compound is the most straightforward representation of the atom counts in the molecule as whole numbers.
As a straightforward illustration of this idea, consider the empirical formula of sulfur monoxide, which is denoted by the symbol SO, and compare it to the empirical formula of disulfur dioxide, which is denoted by the symbol S2O2.
moles of CO_2=[tex]\frac{ 1.6004 }{44.01}[/tex]
moles of CO_2= 0.0364 moles
moles of H_2O=[tex]\frac{0.6551}{ 18.01 }[/tex]
moles of CO_2= 0.0364 moles
It takes 0.0364 moles of carbon to make up 1 mole of carbon dioxide.
1 mole of H2O contains 2 moles of hydrogen, which is equal to 2 times 0.0364, or 0.0728 moles of hydrogen.
C & H = 0.0364 x 12.01
C & H= 0.437 g C
0.0728 x 1.008 = 0.0734 gH
Mass O = 0.8009 -(0.437 + 0.0734)
Mass O= 0.2905 g
O moles=[tex]\frac{0.2905}{16}[/tex]
O moles= 0.0182 moles
C = [tex]\frac{0.0364}{ 0.0182}[/tex]
C= 2
H =[tex]\frac{0.0728}{ 0.0182}[/tex]
H = 4
O =[tex]\frac{0.0182}{ 0.0182 }[/tex]
O= 1
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What happens when a solute dissolves in water?
Answer:
Dissociate
When a solute dissolves in water, a solution is formed.
What is a solute?A solute is any substance capable of dissolving in a solvent in order to form a solution.
When a solute dissolves in a particular solvent, it is said to be that solvent-soluble. Otherwise, it is insoluble.
Now, when the solvent in question is water, the substance is said to be water-soluble or water-insoluble as the case may be.
If a solute is water-soluble, then it forms a solution. If the solute is ionic, it does not just form a solution, it dissociates into its component ions in the solution.
If the solute is not ionic, no dissociation occurs in the solution.
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What is the difference between structure and function in plants and animal cell organelles
Answer:
cell wall
Explanation:
plant cell have cell wall and can go through the process of plasmolysis.
they also contain stoma
animal cell are smaller
Write the balanced NET ionic equation for the reaction when (NH4)2CO3 and CaCl2 are mixed in aqueous solution.
The balanced NET ionic equation for the reaction when (NH₄)₂CO₃ and CaCl₂ are mixed in aqueous solution.
Ca²⁺(aq) + CO₃²⁻(aq) ---> CaCO₃(s)
The reaction is :
(NH₄)₂CO₃ + CaCl₂ -----> NH₄Cl + CaCO₃
1) the balanced molecular eqaution :
(NH₄)₂CO₃(aq) + CaCl₂(aq) -----> 2NH₄Cl(aq) + CaCO₃(s)
2) split strong electrolytes into ions : complete ionic equation
2NH₄⁺ + CO₃²⁻ + Ca²⁺ + 2Cl⁻ -----> 2NH₄⁺ + 2Cl⁻ + CaCO₃
3) eliminate the spectator ions on both sides of ionic equation:
CO₃²⁻(aq) + Ca²⁺(aq) ---> CaCO₃(s)
4) The net ionic equation is :
Ca²⁺(aq) + CO₃²⁻(aq) ---> CaCO₃(s)
Thus, The balanced NET ionic equation for the reaction when (NH₄)₂CO₃ and CaCl₂ are mixed in aqueous solution.
Ca²⁺(aq) + CO₃²⁻(aq) ---> CaCO₃(s)
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Fe(OH)2(s) + O2(g) +OH-Fe(OH)3(s) + H2O balance in basic solution
Fe(OH)₂(s) + O₂(g) +OH → Fe(OH)₃(s) + H₂O balance in basic solution is 4Fe(OH)₂ (s) + O₂(g) + 2H₂O → 4Fe(OH)₃(s)
A basic solution is an aqueous solution containing more OH⁻ ions than H⁺ ion
The unbalanced redox equation is as follows:
Fe(OH)₂(s) + O₂(g) +OH → Fe(OH)₃(s) + H₂O
In the chemical reaction all atoms other than hydrogen and oxygen are balanced and the oxidation number of fe changes from 2 to 3 and the change in the oxidation number is 1 and the oxidation number of fe changes from 0 to -2 and for 2O atoms the change in the oxidation number is 4 and then balance the equation with increase in the oxidation number and with decrease in the oxidation number
Fe(OH)₂(s) and Fe(OH)₃(s) with 4 then,
4Fe(OH)₂(s)+O₂(g) → 4Fe(OH)₃(s)
To balance O atoms, add 2 water molecules on LHS,
4Fe(OH)₂ (s) + O₂(g) + 2H₂O → 4Fe(OH)₃(s)
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how many grams of silver iodide, AgI, are produced from 43.3 g of calcium iodide, CaI2?
Taking into account the reaction stoichiometry, 121.89 grams of AgI are produced from 43.3 g of calcium iodide.
Reaction stoichiometryIn first place, the balanced reaction is:
CaI₂ + 2 AgNO₃ → 2 AgI + Ca(NO₃)₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CaI₂: 1 moleAgNO₃: 2 molesAgI: 2 molesCa(NO₃)₂: 1 moleThe molar mass of the compounds is:
CaI₂: 166.9 g/moleAgNO₃: 169.87 g/moleAgI: 234.77 g/moleCa(NO₃)₂: 164 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
CaI₂: 1 mole ×166.9 g/mole= 166.8 gramsAgNO₃: 2 moles ×169.87 g/mole= 339.74 gramsAgI: 2 moles ×234.77 g/mole= 469.54 gramsCa(NO₃)₂: 1 mole ×164 g/mole= 164 gramsMass of AgI formedThe following rule of three can be applied: if by reaction stoichiometry 166.8 grams of CaI₂ form 469.54 grams of AgI, 43.3 grams of CaI₂ form how much mass of AgI?
mass of AgI= (43.3 grams of CaI₂×469.54 grams of AgI)÷ 166.8 grams of CaI₂
mass of AgI= 121.89 grams
Finally, 43.3 grams of CaI₂ form 121.89 grams of AgI.
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What are the wastes product from cellular respiration
22.5g of potassium carbonate is dissolved in water and then mixed with excess aluminum nitrate. How many moles of dried precipitate should be formed?
Explanations
[tex]3K_2CO_3(aq)+2Al_2\operatorname{\lparen}NO_3)_3+3H_2O\rightarrow2Al(OH)_3+3CO_2+6KNO_3[/tex]Given the following
Mass of potassium carbonate = 22.5grams
Determine the moles of potassium carbonate
Moles of potassium carbonate = mass/molar mass
22.5/138.205|
= 0.1628moles
Since the precipitate formed is aluminum hydroxide, hence the mole of precipitate formed if 3moles off K2CO3 produce 2moles of Al(OH)3 is given as:
[tex]\begin{gathered} mole\text{ of Al\lparen OH\rparen}_3=\frac{2}{3}\times0.1628 \\ mole\text{ of Al\lparen OH\rparen}_3=0.1085moles \end{gathered}[/tex]Hence the moles of dried precipitate should be formed
Consider the reaction.2 Pb(s) + O₂(g) →→→ 2 PbO(s)->An excess of oxygen reacts with 451.4 g of lead, forming 316.9 g of lead(II) oxide. Calculate the percent yield of the reaction.
In this question, we have the following reaction:
2 Pb + O2 -> 2 PbO
We have to find the percent yield of this reaction, we have:
451.4 grams of Pb
316.9 grams of PbO, this is the actual yield, we will have to find the theoretical yield now
In order to find the theoretical yield, we need to know how many moles of Pb we have in 451.4 grams, the molar mass of Pb is 207.2g/mol
207.2g = 1 mol
451.4 g = x moles
207.2x = 451.4
x = 451.4/207.2
x = 2.18 moles of Pb in 451.4 grams
According to the molar ratio of Pb and PbO, we have the ratio of 2 moles of Pb to form 2 moles of PbO, therefore if we have 2.18 moles of Pb, we will also have 2.18 moles of PbO.
Now we need to find the theoretical mass of PbO, using its molar mass, 223.2g/mol
223.2g = 1 mol
x grams = 2.18 moles
x = 2.18 * 223.2
x = 486.6 grams of PbO is the theoretical yield
Now to find the percent yield, we need to use the following formula:
%yield = (actual yield/theoretical yield)*100
%yield = (316.9/486.6)*100
%yield = 65
The percent yield of this reaction will be 65%
hexane has a density of 0.659 g/ ml. How many milliliters (mL) would a student need to pour in order to get 49.5 g if he hexane?
Answer:
75.114ml
Explanation:
volume = mass÷ density
Which substances have the same empirical formula?
Sample Formula
1 CH3OH
2 CH2O
3 C6H12O6
4 C2H4O2
5 C7H5O2
6 C8H8
a. Samples 1 and 3
b. Samples 1, 2, and 4
c. Sample 1 and 4
d. Samples 2, 3, and 4