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

Molecular Formula

General Chemistry

3. Chemical Reactions

Molecular Formula

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Multiple Choice

The molar mass of a compound is 52.07 g/mol. Its empirical formula is CH. Determine the molecular formula of the compound.

C6H6

C4H4

C2H2

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Verified step by step guidance

First, determine the molar mass of the empirical formula CH. Carbon (C) has a molar mass of approximately 12.01 g/mol, and hydrogen (H) has a molar mass of approximately 1.01 g/mol. Therefore, the molar mass of CH is calculated as:

12.01 + 1.01

g/mol.

Calculate the molar mass of the empirical formula CH:

12.01 + 1.01 = 13.02

g/mol.

Next, determine how many times the empirical formula mass fits into the given molar mass of the compound, which is 52.07 g/mol. Divide the molar mass of the compound by the molar mass of the empirical formula:

\frac{52.07}{13.02}

The result from the division will give you the number of empirical units in the molecular formula. This number should be a whole number, indicating how many times the empirical formula is repeated in the molecular formula.

Multiply the subscripts in the empirical formula CH by the whole number obtained from the division to find the molecular formula. If the division yields 4, for example, the molecular formula would be C₂H₂.