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

Stoichiometry

General Chemistry

3. Chemical Reactions

Stoichiometry

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Multiple Choice

In the reaction 2 C2H6O + 2 K2Cr2O7 + 8 H2SO4 → 2 Cr2(SO4)3 + 2 K2SO4 + 3 CH3COOH + 11 H2O, if the rate of appearance of Cr2(SO4)3 is 1.24 mol/min, what is the rate of disappearance of C2H6O?

1.24 mol/min

2.48 mol/min

3.72 mol/min

0.62 mol/min

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Verified step by step guidance

Identify the stoichiometry of the reaction: The balanced chemical equation is 2 C2H6O + 2 K2Cr2O7 + 8 H2SO4 → 2 Cr2(SO4)3 + 2 K2SO4 + 3 CH3COOH + 11 H2O. Notice that the stoichiometric coefficient for C2H6O is 2 and for Cr2(SO4)3 is also 2.

Understand the relationship between the rates of disappearance and appearance: According to the stoichiometry, the rate of disappearance of C2H6O is directly proportional to the rate of appearance of Cr2(SO4)3. Since both have the same stoichiometric coefficient, their rates are equal in magnitude.

Use the given rate of appearance of Cr2(SO4)3: The problem states that the rate of appearance of Cr2(SO4)3 is 1.24 mol/min.

Apply the stoichiometric relationship: Since the stoichiometric coefficients for C2H6O and Cr2(SO4)3 are the same (both are 2), the rate of disappearance of C2H6O will be the same as the rate of appearance of Cr2(SO4)3.

Conclude the rate of disappearance: Therefore, the rate of disappearance of C2H6O is 1.24 mol/min, as it is directly proportional and equal to the rate of appearance of Cr2(SO4)3.