Table of contents

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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

2. Atoms & Elements

Calculating Molar Mass

General Chemistry

2. Atoms & Elements

Calculating Molar Mass

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Multiple Choice

What is the mass of sodium (Na) in grams present in 7.5 grams of sodium benzoate (NaC7H5O2)?

0.69 grams

3.45 grams

2.30 grams

1.15 grams

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Verified step by step guidance

Determine the molar mass of sodium benzoate (NaC7H5O2) by adding the atomic masses of all the atoms in the formula: Na, C, H, and O.

Calculate the molar mass of sodium (Na) using the periodic table.

Find the mass percentage of sodium in sodium benzoate by dividing the molar mass of sodium by the molar mass of sodium benzoate and then multiplying by 100 to get a percentage.

Use the mass percentage of sodium to calculate the mass of sodium in 7.5 grams of sodium benzoate by multiplying the mass percentage (as a decimal) by 7.5 grams.

Verify the calculation by checking if the calculated mass of sodium matches one of the provided answer choices.