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

What mass, in grams, of potassium chlorate (KClO3) is needed to contain 0.8542 mol of oxygen atoms?

34.5 grams

122.5 grams

69.0 grams

45.8 grams

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Verified step by step guidance

First, understand the chemical formula of potassium chlorate (KClO3). It contains one potassium (K) atom, one chlorine (Cl) atom, and three oxygen (O) atoms.

Next, determine the number of moles of KClO3 needed to provide 0.8542 moles of oxygen atoms. Since each molecule of KClO3 contains three oxygen atoms, you need to divide the moles of oxygen atoms by 3 to find the moles of KClO3. Use the formula:

\frac{0.8542}{3}

Calculate the molar mass of KClO3. Add the atomic masses of potassium (K), chlorine (Cl), and three oxygen (O) atoms. Use the periodic table to find these values: K = 39.10 g/mol, Cl = 35.45 g/mol, O = 16.00 g/mol. The molar mass of KClO3 is: