Answer:
10.0 g C12H22O11 (mol/342.34 g) (1/0.500 L) = 0.06 M C12H22O11 => 1 sig.
Explanation:
According to molar concentration,0.00876 liter of 0.500 M sucrose contain 1.5 kg of sucrose.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Volume is obtained by using molar concentration formula, 0.500×342.3/1.5×10³=114.1×10[tex]^-3[/tex]=1/V
Thus,volume=1/114.1×10[tex]^-3[/tex]=0.00876 M.
Thus, the volume of sucrose solution is 0.00876 M.
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plastics are created from processed petroleum which is pulled up from below the ground. this is important because
Plastic items are not biodegradable and contaminate the environment, petroleum is a non-renewable resource, and processing and consuming petroleum emits toxins into the environment.
What does the term "biodegradable" mean?We refer to a substance as being biodegradable if it can be naturally broken down by living things in an environment. Simply explained, the term "biodegradable" refers to a substance that gradually deteriorates into smaller parts like gases and sugar. Microorganisms, such as fungi and bacteria or microbes to be reabsorbed by the surrounding environment, ideally without generating any pollutants, are responsible again for biodegradation.
What is a example of biodegradable?Examples of biodegradable materials that microbes can break down include food and paper waste.
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I need help please, can't figure this one out.
The relative atomic mass of the rubidium atom could be calculated from the data provided as 85.46.
What is an isotope?When we talk about an isotope, we are referring to the idea that we could have tow or more atoms of the same element that have the same atomic number but do not have the same mass number. Given that the atomic number is the number of protons, it then follows that the two elements as we know them does differ only in the number of the neutrons that they have. The atoms that we have thus described in the several lines above are other wise called the isotopes of the element. We have in the image of the question a clear example of what an isotope is and we now want to find the relative atomic mass of Rubidium.
The relative atomic mass can be obtained from the use of the formula;
(84.9118 * 72.2/100) + (86.9092 * 27.8/100)
= (61.30 + 24.16)
= 85.46
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Please see photo for question
Ionization energy is the minimum energy required to remove an electron from an isolated atom in the gaseous state, that is, in its ground state.
At the periodic table, we can see that there is a pattern for the first ionization energy.
It increases from bottom to top in a group, and from left to right in a period.
So:
Argon and Helium are on the far right of the periodic table, while sodium and potassium are on the far left.
So Argon and Helium have the highest ionization energy in comparison to Potassium and Sodium.
Between Argon and Helium, Helium is above argon in the periodic table, this means that helium has the highest ionization energy.
Answer: Helium
An object that weighs 10.045 g at room temperature may end up weighing _______ when it becomes very cold (select the correct answer): a) 9.085 g. b) 10.160 g. c) 20.045 g. Explain your answer
An object that weighs 10.045 g at room temperature may end up weighing 10.16g when it becomes very cold since the weight will increase slightly.
What is the effect of temperature on weight of substance?The relationship between density and temperature is inversely proportional. As the temperature of a substance decreases, the weight of the substance increases, vice versa.
During the process of decrease in temperature, the molecules of the object come together and becomes very dense, hence increase in the weight of the object.
As the temperature increases, the molecules of the object moves further apart becoming less dense, hence the decrease in the weight of the object.
Thus, an object that is initially at room temperature will weight more when the temperature decreases.
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which of the following reactions is balanced and shows incomplete combustion?
The reaction that is chemically balanced and shows complete combustion is [tex]C_3 H_8 + 5 O_2 -- > 3 CO_2 + 4 H_2 O[/tex], Option B.
What is a balanced equation?A balanced equation is an equation that obeys the law of conservation of atoms.
According to this law, atoms cannot be created and cannot be destroyed during the course of chemical reactions. The atoms can, however, be converted into different forms.
Thus, a balanced equation must have an equal number of participating atoms on both the reactant and product sides of the equation.
Also, a complete combustion reaction must produce carbon dioxide and water. Not carbon monoxide.
Therefore, the equation that fulfills the two conditions is[tex]C_3 H_8 + 5 O_2 -- > 3 CO_2 + 4 H_2 O[/tex]
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Answer:
C
Explanation:
I got it right
Which of the following statements about atoms is NOT correct? Responses Atoms are electrically neutral when the number of protons are equal to the number of electrons All atoms of a given element must have the same number of protons, neutrons, and electrons Most of the volume of an atom contains only electrons Almost all of the mass of an atom is in the nucleus
According to the research, the correct answer is All atoms of a given element must have the same number of protons, neutrons, and electrons. It is the statement about atoms that is NOT correct.
What are atoms?It is a particle that consists of a central nucleus, positively charged with protons and neutrons, in which practically all the mass of the atom is concentrated.
In this sense, in the outer zone are the electrons, which occupy orbits, whose number varies according to the chemical element, also in a given element it can have a different number of neutrons.
Therefore, we can conclude that atoms are distinguished from each other thanks to the configuration of their particles, it is also true that all atoms of the same element are exactly the same, where the number of neutrons can vary.
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i need help with chemistry equation
From the data provided and the equation of reaction:
The maximum amount in grams of ammonia (NH₃) gas that can be formed is 2.83 gramsThe formula of the limiting reagent is N₂.The amount of the excess reagent that remains after the reaction is complete is 3.67 grams.What is the maximum amount of the product that can be formed?The maximum amount of the product that can be formed is calculated from the equation of reaction as follows:
3H₂ (g) + N₂ (g) ---> NH₃ (g)From the equation of reaction, the mole ratio of hydrogen to nitrogen is 3 : 1
From the given data:
mass of hydrogen reacting = 4.65 grams
mass of nitrogen reacting = 4.67 grams
The moles of the reactants is determined as follows:
moles = mass/ molar massmolar mass of hydrogen gas = 2.0 g
molar mass of nitrogen gas = 28.0 g
Moles of hydrogen = 4.65/2 = 2.325 moles
Moles of nitrogen = 4.67/28 = 0.1667 moles
mole ratio of hydrogen to nitrogen is 2.325 : 0.1667 = 14 : 1
The limiting reagent is nitrogen while the excess reagent is hydrogen.
The formula of nitrogen is N₂.
Hence, the maximum moles of ammonia (NH₃ ) that can be formed is 0.1667 moles.
mass of ammonia formed = moles * molar massmass of ammonia formed = 0.1667 * 17 grams
mass of ammonia formed = 2.83 g
The moles of the excess reagent remaining after the reaction is complete = 2.335 - (0.1667 * 3) = 1.835
moles of the excess reagent remaining = 1.825 moles
mass = moles * molar massmass of the excess reagent remaining = 1.825 * 2
mass of the excess reagent remaining = 3.65 grams
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PLEASE ANSWER THIS! i need help w/both asap
If the half life of radium-226 is 1,600 years, how long will it take for 93.75% of a sample of radium-226 to decay?
Sodium-24 has a half life of 15 days. What fraction of the original amount of sodium-24 will remain in a sample after 105 days?
Based on the half-lives of the given materials:
Number of years it take for 93.75% of a sample of radium-226 to decayis 6400 years.Fraction of Sodium-24 remaining after 105 days is 0.78 % .What is the half-life of a substance?The half-life of a substance is the time taken for half the amount present in the original sample of a substance to decay.
The half-life of a substance is constant.
Considering the given questions:
1. the half life of radium-226 is 1,600 years, how long will it take for 93.75% of a sample of radium-226 to decay?
The amount of remaining after 93.75% have decayed = 100 - 93.75 = 6.25%
The number of half-lives that will result in 6.25 % remaining will be:
After first half life = 50% remains
After second half life = 25% remains
After third half life = 12.5% remains
After fourth half life = 6.25% remains
Number of years taken = 4 * 1600
Number of years taken = 6400 years
2. Sodium-24 has a half life of 15 days. What fraction of the original amount of sodium-24 will remain in a sample after 105 days?
Number of half lives after 105 days = 105/15
Number of half lives after 105 days = 7 half lives
Fraction remaining = (¹/₂)⁷
Fraction remaining = 0.78 %
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i need help with chemistry equation
The maximum amount of sulfur dioxide (SO₂) that can be formed is 25.6 g.
The formula for the the limiting reagent is CO
The amount of excess reagent that remains after the reaction is 3.6 g.
What is limiting reagent?The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.
The limiting reagent is determined by balancing the chemical equation as follows;
S + 2CO --------> SO₂ + 2C
From the reaction above;
1 mole of sulfur = 2 mole of carbon monoxide = 1 mole of sulfur dioxide
56 g of carbon monoxide (CO) = 64 g of sulfur dioxide (SO₂ )
22.4 g of CO = ? of SO₂
= (22.4 x 64)/56
= 25.6 g of SO₂
Thus, the maximum amount of sulfur dioxide (SO₂) that can be formed is 25.6 g.
The formula for the the limiting reagent is CO because it will be completely used up.
56 g of CO = 32
22.4 of CO = ?
= (22.4 x 32)/56
= 12.8 g
Excess mass of the sulfur that remains = 16.4 g - 12.8 g = 3.6 g
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I need help with this homework assignment problem
Answer:
A. Ar+2
B. 18
C. 0
Explanation:
There are total of 2 + 2 + 6 + 2 + 4 = 16 electrons
since the cation is +2, it's neutral state should be 16 + 2 = 18
A. The ion is Ar+2
B. 18
C. Since 3p => 4s => 3d, there is no 3d
Move the atoms around to show how many of each element in the reactant and product.
Write the coefficients in the boxes across the bottom to write the balanced equation.
The balanced equation of the reaction is:
CH₄ (g) + 4 Cl₂ (g) ---> CCl₄ (l) + 4 HCl (g)What are balanced equations?Balanced equations are equations in which the moles of atoms on the right-hand side of the equation are equal to the moles of atoms on the left-hand side of the equation.
Balanced equations ensure that the law of the conservation of mass is obeyed such that the mass of reactants is equal to the mass of the products.
In balancing a chemical equation, the following steps are followed:
determine the moles of atoms of each of the elements found on the reactant side as well as the product side of the reactionadd coefficients in front of the formula of the compound or elements reacting to ensure that the moles of atoms are equal on both sides of the reaction.Considering the given reaction:
In the reaction, methane gas reacts with chlorine gas to produce tetrachloromethane and hydrogen chloride gas.
The balanced equation of the reaction is given below as follows:
CH₄ (g) + 4 Cl₂ (g) ---> CCl₄ (l) + 4 HCl (g)
The reaction is a substitution reaction in which chlorine atoms substitute hydrogen atoms in the methane gas molecule.
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How much of a 1/20 dilution will .5ml of serum make
0.5 mL of serum with 1/20 dilution will be equivalent to 10 mL of the diluted serum.
DilutionA 1/20 dilution means 1 part of the original solution and 19 parts of the solvent that is being used to dilute.
Now, a 1/20 dilution of a 0.5 mL serum means that the 1 part of the stock solution is 0.5 mL. The remaining 19 parts would be in multiples of 0.5 mL.
19 x 0.5 = 9.5 mL.
This means that 9.5 mL of the diluting solvent will be added to 0.5 mL of the stock solution resulting in a total of 10 mL.
In order words, 1/20 dilution of 0.5 mL of serum will make a total volume of 10 mL.
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9N 18N Draw the net force arrow on the diagram and state the direction. Net force direction=
The Net force is 20.12 N and acts in a direction 26.56° South of East.
What is a Net Force?A net force is a force that is the vector sum of all the forces acting on an object.
The net force is also known as the resultant force.
The net force produces the same effect as all the forces acting together on an object.
The net force of the given forces in the diagram is calculated as follows:
The forces acting on the object are an 18 N force acting in a direction to the east and a 9 N force acting vertically downward in a direction south of the object.
The two forces form two sides of a right angle triangle.
Net force is calculated using Pythagoras' rule:
Net force = √ (18² + 9²)
Net force = √ (324 + 81)
Net force = √ 405
Net force = 20.12 N
The direction of the Net force = tan⁻¹ (9 / 18)
The direction of the Net force = tan⁻¹ 0.5
The direction of the Net force = 26.56° South of East
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John measured the mass of copper sulfate salt to be 5.9 g. The actual mass was 6.0 g. What is his percent error? Show all work.
balanced net ionic equation Pb2+(aq) + S2−(aq) → PbS(s)
The balanced net ionic equation for the reaction is given below:
Pb²⁺ (aq) + S²⁻ (aq) → PbS (s)
What are ionic equations?Ionic equations are equations that show the ionic species involved i a reaction.
The ionic species in the reaction may undergo reduction or oxidation.
Therefore, ionic equations are usually redox reactions.
In balancing ionic equations, the atoms and the electrons involved in the reaction are balanced on both sides.
Considering the given ionic equation:
Pb²⁺ (aq) + S²⁻ (aq) → PbS (s)
The given equation above is a balanced net ionic equation both in electron transfer as well as in the number of atoms.
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Name of the anion in the ionic compound, Mg(ClO4)2, NH4NO3, Cu(CH3CO2)2, K2SO3
In given ionic compound, Mg(ClO4)2 anion is ClO4⁻, NH4NO³ anion is (NO3)⁻, Cu(CH3CO2)² anion is [CH3COO]⁻, K2SO³ anion is SO3²⁻.
What is a anion and cation?Positively charged ions are known as cations. Ions with negative charges are referred to as anions. A charged molecule or an atom is an ion. A balanced atom will change into a positively charged cation if one or more of its electrons are lost.
When non-metals gain electrons, they are created. They don't lose any protons and gain one or more electrons. They get a negative net charge as a result. The anions iodide (I-), chloride (Cl-), and hydroxide are some examples (OH–).
What are the uses of an anion?Anion exchange device applications. They lower the levels of nitrate, arsenic, and sulfate in water. Point-of-use units only filter harmful chemicals out of drinking and cooking water and are connected to a single tap.
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jfvbgbgvcfxfhhgIhhjj
Answer: what?
Explanation:
Answer: Huh?
Explanation:
look at the picture
Answer:
107 g
Explanation:
Calculate the energy, in joules, required to ionize a hydrogen atom when its electron is initially in the n=3 energy level. The energy needed to ionize a ground-state hydrogen atom is 2.18 x 10-18 J. The energy for ionization from the n = 3 state is ______J
The energy required to ionize a hydrogen atom from the n = 3 energy level is 2.422 x 10 ⁻¹⁹J.
Explanation:The amount of energy required to remove an electron from an atom from its excited state to a ground state is referred to as the energy required for ionization.The energy of ionization is determined by two factors: the force of attraction between electrons and the nucleus. The repulsion force between electrons.Determine the number of electrons in the atom. Unless the atom has already lost some electrons, this number is the same as Z. Calculate the ionization energy of a one-electron atom in electron volts by squaring Z and then multiplying the result by 13.6.in the given question ,
The ionization energy can be expressed as follows:
E = 2.18 x 10 ⁻¹⁸ (1/n₁² - 1/∞²)
given , n = 3
E = 2.18 x 10 ⁻¹⁸ (1/3² - 1/∞²)
E = (2.18 x 10 ⁻¹⁸) / 9
E = 2.422 x 10 ⁻¹⁹
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help please, and put explanation if possible!! :)
Answer:
Explanation:
Here's a quick review of the types of reactions.
Synthesis:
Two or more chemicals combine to make a new one.
Ie: A+B => AB or A+B => C
Decomposition:
The opposite of synthesis.
Ie: AB => A+B, C => A+B
Combustion:
Usually something reacting with oxygen. That something usually being a carbohydrate.
Ie: CH4 + 2O2 => CO2 + 2H2O
Single replacement:
One atom or molecule of a compound is knocked out of place and replaced by another chemical
Ie: A+BC => AB + C (note how the bond between B and C break while a bond between A and B form)
Double replacement:
A little like a single replacement, but two bonds break and two new bonds form between two reactants.
Ie: AB+CD => AC+BD
The actual answer
The first equation (2C3H7OH + 9O2....)
Is a combustion reaction because it contains oxygen and the oxygen is oxidizing something.
The second equation (2Al + 3 ZnCl2...)
Is a single replacement reaction because only one type of bond is being broken (the Zn---Cl bond) and only another one type of bond is formed (The Al---Cl bond)
The third equation (NaCl + AgNO3...)
Is a double replacement reaction because two types of bonds are being broken (Na---Cl and Ag---NO3) and two new bonds are forming (Ag---Cl and Na---NO3)
The fourth equation (N2H8CO3...)
Is a decomposition reaction because there is only one reactant and it is splitting into multiple pieces
The fifth equation (2Al + 3Br2...)
Is a synthesis reaction because two elements/ compounds are being combined to make a singular new compound
11. How many grams of nickel (ii) hydroxide will be produced if the following react completely?
2 KOH (aq) + NiCl2 (aq) → 2 KCI (aq) + Ni(OH)2 (S)
a. 30.4 mL of 0.673 M KOH
b. 17.6 mL of 0.841 M NiCl2
0.9541 grams of nickel (ii) hydroxide will be produced if 30.4 mL of 0.673 M KOH react completely and 1.3764 grams of nickel (ii) hydroxide will be produced if the 17.6 mL of 0.841 M NiCl₂ react completely.
According to the balanced chemical equation,
2KOH (aq) + NiCl₂ (aq) → 2 KCI (aq) + Ni(OH)₂ (S)
a. 2 Moles of KOH = one mole of Ni(OH).
As we know,
Molarity = moles/amount of solution(in liters)
For KOH,
0.675 = moles/0.0304
Moles of KOH = 0.02052.
Moles of Ni(OH) = 0.02052/2
Moles of Ni(OH) = 0.01026
We also know,
Moles = formed mass/molar mass
Molar mass of NiOH = 93 grams/mole
0.01026 = formed mass/93
Formed mass of NiOH = 0.9541 grams.
b. 1 Mole of NiCl₂ = one mole of Ni(OH).
As we know,
Molarity = moles/amount of solution(in liters)
For NiCl₂,
0.841 = moles/0.0176
Moles of NiCl₂ = 0.01480
Moles of Ni(OH) = 0.01480
We also know,
Moles = formed mass/molar mass
Molar mass of NiOH = 93 grams/mole
0.01480 = formed mass/93
Formed mass of NiOH = 1.3764 grams.
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what is the formula for calcium nitrate
Answer:Ca(No3)2
Explanation:
A mining company wants to build a modern processing plant that is safe for workers. The location of the plant is close to the mining operation, which has inadvertently exposed some sources of radionuclides. Which is the best reason for consulting with a nuclear chemist before building the processing plant? to determine the level of radionuclides present to explain the health concerns that are related to radiation to destroy all the radionuclides in the area immediately to conduct tests to see if workers are affected by radiation
To determine the level of radionuclides present is the best reason for consulting with a nuclear chemist before building the processing plant.
What does the level of radionuclides mean?The level of radionuclides refers to the concentration in the atmosphere of radioactive compounds, which may be harmful to humans and therefore theirs levels should be monitored in order to maintain well being, especially in nuclear plants where they can be dangerous to the environment.
Therefore, we can conclude that it is required to know the level of radionuclides that are present in a processing plant.
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Answer:a
Explanation:
What mass of Ca(OH), is present in a sample if it is titrated to its equivalence point with 44.02 mL of 0.0885 M HNO3? The balanced chemical equation is as follows:
2HNO3+Ca(OH)2 ➠Ca(NO3)2+2H20
A mass of 0.141 g Ca(OH) is present in a sample if it is titrated to its equivalence point with 44.02 mL of HNO3.
What is titration and how the mass comes out to be 0.141 g?Given 44.02 mL of 0.0885 M HNO3 , when divided by 1000 will be equal to 0.0038 moles.Two moles required to neutralize one mole of calcium hydroxide.Dividing 0.0038 by 2 , since they are followed by two mole we get 0.0019. Finally when we come to calculate the hydroxide.Its mass equals 0.141g. Now titration is a familiar word we have read in the practicals of chemistry.Titration actually is a phenomena to figure out the amount of substance present in a liquid by figuring out the further amount of it needed for the reaction.To know more about titration visit:
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Classify each of the following as exothermic or endothermic:
a. C3H8(g) + 5O2(g) -->3CO2(g) + 4H2O(g) + 2220 kJ
b. 2Na(s) + Cl2(g) --> 2NaCl(s) + 819 kJ
c. PCl5(g) + 67 kJ --> PCl3(g) + Cl2(g)
Write the balanced chemical equation and chemical reaction. Hydrogen + Oxygen=Water H₂ +0₂= 2H2O
The balanced chemical equation of the chemical reaction of hydrogen and oxygen is:
2 H₂ (g) + O₂ (g) → 2H₂O (l)
What is the balanced chemical equation?A balanced chemical equation is an equation in which the number of atoms of each element on the left side of the arrow (reactant side) is equal to the number of atoms of each element on the right side (product side) of the arrow.
A chemical equation is a way to express the chemical reaction in terms of symbols of the substances. It is very important that a balanced chemical equation must obey the law of conservation of mass.
By following the law, the total mass of the elements left side or reactant side should be equal to the total mass of elements on the right side (product side) in a balanced chemical equation.
Given, the chemical reaction of the water formation is as follows:
H₂ (g) + O₂ (g) → 2H₂O (l)
The number of oxygen on both sides is equal but the number of hydrogens is unequal. So multiply the hydrogen gas on the left side by 2.
So the balanced chemical equation of water formation becomes:
2 H₂ (g) + O₂ (g) → 2H₂O (l)
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Orange light has a wavelength of 605nm.
What is the frequency of the light?
The frequency of light is the ratio of speed to the wavelength. Then, the frequency of range light with the wavelength of 605 nm is 4.95 × 10¹⁴ Hz.
What is frequency of light?Frequency of light refers to the number of waves of electromagnetic radiation (such as light) that pass a given point per second. It is typically measured in Hertz (Hz), which represents the number of cycles per second.
The frequency of light determines its color and is directly related to its energy. Light with higher frequency has more energy and shorter wavelengths, while light with lower frequency has less energy and longer wavelengths.
Speed of light = 3 × 10⁸ m/s
wavelength = 605 nm = 605 × 10⁻⁹ m.
then frequency = 3 × 10⁸ m/s / 3 × 10⁸ m/s = 4.95 × 10¹⁴ Hz
Therefore, the frequency of the orange light is 4.95 × 10¹⁴ Hz.
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What's the molality of a solution with 120 g of NaCl and 30 kg of water?A)0.068B)0.004C)0.25D)6.8
Explanation:
Molality is the ratio of the amount of substance of a solute (in moles – n) to the mass in kilograms of the solvent (m).
The symbol for molality is usually W and it can be calculated by the following formula:
W = n/m
here, we need to calculate n of NaCl using the formula:
n = m/MM
where MM of NaCl is 58.5 g/mol
n = 120/58.5
n = 2.05 moles
W = 2.05/30
W = 0.068 mol/Kg
Answer: A) 0.068
what is the volume of a cube that has an edge length od 0.017m
The volume of the cube that has an edge length of 0.017m is 4.9 × 10-⁶m³.
How to calculate volume of a cube?Volume is a three-dimensional measure of space that comprises a length, a width and a height. It is measured in units of cubic centimeters in metric, cubic inches or cubic feet.
The volume can be calculated by multiplying the length, breadth and height of a three-dimensional shape such as cube.
According to this question, a cube has an edge length of 0.017m. The volume can be calculated as follows:
Volume = 0.017 × 0.017 × 0.017
Volume = 0.000004914
Volume = 4.9 × 10-⁶m³
Therefore, 4.9 × 10-⁶m³ is the volume of the cube
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b. Based on these half-reactions, write the reduction potentials for the electrodes that correspond to
points A and B on the graph, assuming standard conditions. (2 points)
A standard electrode potential is required in order to determine the reduction potential of a half-unique cell. The standard hydrogen electrode is used as a reference electrode for the measurement
What is the half cell's typical electrode potential?A standard electrode potential is required in order to determine the reduction potential of a half-unique cell. The standard hydrogen electrode is used as a reference electrode for the measurement (abbreviated to SHE). SHE has an electrode potential of zero volts.
How can the anode and cathode be determined from the reduction potential?By deducting the standard reduction potential for the reaction occurring at the cathode from the standard reduction potential for the reaction occurring at the anode, the standard reduction potential can be computed. Because oxidation is the polar opposite of reduction, the minus sign is required.
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