Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

6. Chemical Reactions & Quantities

Percent Yield

GOB Chemistry

6. Chemical Reactions & Quantities

Percent Yield

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Multiple Choice

What is the percent yield for a reaction in which 22.1 g Cu is isolated by reacting 45.5 g Zn with 70.1 g CuSO₄?
Zn (s) + CuSO₄ (aq) → Cu (s) + ZnSO₄ (aq)

63.1 %

90.7 %

79.2 %

67.1 %

50.0 %

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Verified step by step guidance

Identify the balanced chemical equation for the reaction: Zn (s) + CuSO4 (aq) → Cu (s) + ZnSO4 (aq). This indicates a 1:1 molar ratio between Zn and Cu.

Calculate the moles of Zn used: Use the molar mass of Zn (approximately 65.38 g/mol) to convert 45.5 g of Zn to moles.

Calculate the moles of CuSO4 available: Use the molar mass of CuSO4 (approximately 159.61 g/mol) to convert 70.1 g of CuSO4 to moles.

Determine the limiting reactant: Compare the moles of Zn and CuSO4 to find which reactant is limiting, based on the 1:1 molar ratio.

Calculate the theoretical yield of Cu: Use the moles of the limiting reactant to find the theoretical moles of Cu produced, then convert this to grams using the molar mass of Cu (approximately 63.55 g/mol). Finally, calculate the percent yield using the formula: (actual yield / theoretical yield) * 100%.