Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

3. Chemical Reactions

Percent Yield

General Chemistry

3. Chemical Reactions

Percent Yield

Previous problemNext problem

Struggling with General Chemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

When copper is heated with an excess of sulfur, copper(I) sulfide is formed. In a given experiment, 1.50 g of copper was heated with excess sulfur to yield 1.56 g of copper(I) sulfide. What is the percent yield?

92.3%

78.9%

85.7%

100.0%

Previous problemNext problem

Verified step by step guidance

Determine the balanced chemical equation for the reaction: Copper (Cu) reacts with sulfur (S) to form copper(I) sulfide (Cu2S). The balanced equation is: 2Cu + S -> Cu2S.

Calculate the molar mass of copper (Cu) and copper(I) sulfide (Cu2S). The molar mass of Cu is approximately 63.55 g/mol, and the molar mass of Cu2S is approximately 159.16 g/mol.

Convert the mass of copper used (1.50 g) to moles using its molar mass: moles of Cu = mass of Cu / molar mass of Cu.

Use the stoichiometry of the balanced equation to find the theoretical yield of Cu2S. Since 2 moles of Cu produce 1 mole of Cu2S, calculate the moles of Cu2S that should form from the moles of Cu calculated.

Convert the theoretical moles of Cu2S to grams using its molar mass, then calculate the percent yield using the formula: Percent Yield = (actual yield / theoretical yield) * 100, where the actual yield is 1.56 g.