A copper wire having a mass of 2.196 g was allowed to react with an excess of sulfur. The excess sulfur was then burned, yielding SO 2 gas. The mass of the copper sulfide produced was 2.748 g. (a) What is the percent composition of copper sulfide?

Hi everyone today, we have a question asking us to determine the mass percent composition of nitrogen and nitric acid. So first we need to calculate our mass. So we have hydrogen And we only have one of them and it's smaller masses 1.01 grams Permal. And then we have one nitrogen which is .01 g per mole. We have oxygen and we have three of them. Its molar mass is 16.00 g per mole. And then we're going to multiply that by three To give us 48 g per mole. And that gives us a total of .02 g per mole. And we want to find the mass percent composition of nitrogen. So we're going to take nitrogen Molar mass which is 14.01 g per mole. And we're going to divide it by our total grams per mole. Which we calculated to be 63.02. And that's our total molar mass. And then we're going to multiply by 100 to get a percentage And that equals 22.23%. And that is our final answer. Thank you for watching. Bye.

Ch.3 - Mass Relationships in Chemical Reactions

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McMurry 8th Edition

Ch.3 - Mass Relationships in Chemical Reactions

Problem 117a

Chapter 3, Problem 117a

A copper wire having a mass of 2.196 g was allowed to react with an excess of sulfur. The excess sulfur was then burned, yielding SO₂ gas. The mass of the copper sulfide produced was 2.748 g. (a) What is the percent composition of copper sulfide?

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Determine the mass of sulfur that reacted by subtracting the mass of copper from the mass of copper sulfide: \( \text{mass of sulfur} = \text{mass of copper sulfide} - \text{mass of copper} \).

Calculate the percent composition of copper in the copper sulfide by dividing the mass of copper by the mass of copper sulfide and multiplying by 100: \( \%\text{Cu} = \left( \frac{\text{mass of copper}}{\text{mass of copper sulfide}} \right) \times 100 \).

Calculate the percent composition of sulfur in the copper sulfide by dividing the mass of sulfur by the mass of copper sulfide and multiplying by 100: \( \%\text{S} = \left( \frac{\text{mass of sulfur}}{\text{mass of copper sulfide}} \right) \times 100 \).

Verify that the sum of the percent compositions of copper and sulfur equals 100% to ensure the calculations are correct.

Summarize the percent composition of copper sulfide, listing the percent of copper and the percent of sulfur.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Percent Composition

Percent composition refers to the percentage by mass of each element in a compound. It is calculated by dividing the mass of the element in the compound by the total mass of the compound and then multiplying by 100. This concept is essential for determining the contribution of each element to the overall mass of a compound, which is crucial for solving the given problem.

Stoichiometry

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It allows chemists to predict the amounts of substances consumed and produced in a reaction based on balanced chemical equations. Understanding stoichiometry is vital for calculating the mass of copper sulfide produced from the reaction of copper and sulfur.

Chemical Reaction and Products

A chemical reaction involves the transformation of reactants into products, often accompanied by a change in mass. In this case, copper reacts with sulfur to form copper sulfide (CuS). Recognizing the nature of the reaction and the products formed is crucial for determining the mass changes and calculating the percent composition of the resulting compound.

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Textbook Question

A copper wire having a mass of 2.196 g was allowed to react with an excess of sulfur. The excess sulfur was then burned, yielding SO₂ gas. The mass of the copper sulfide produced was 2.748 g. (b) What is its empirical formula?

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Textbook Question

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Open Question

A mixture of XCl3 and XCl5 weighing 10.00 g contains 81.04% Cl by mass. How many grams of XCl3 and how many grams of XCl5 are present in the mixture?

A copper wire having a mass of 2.196 g was allowed to react with an excess of sulfur. The excess sulfur was then burned, yielding SO2 gas. The mass of the copper sulfide produced was 2.748 g. (a) What is the percent composition of copper sulfide?

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Key Concepts

Percent Composition

Stoichiometry

Chemical Reaction and Products

A copper wire having a mass of 2.196 g was allowed to react with an excess of sulfur. The excess sulfur was then burned, yielding SO₂ gas. The mass of the copper sulfide produced was 2.748 g. (a) What is the percent composition of copper sulfide?