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

Mass Percent

General Chemistry

3. Chemical Reactions

Mass Percent

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Multiple Choice

What is the mass percentage of carbon in dimethyl sulfoxide (C2H6SO), rounded to three significant figures?

15.8%

21.1%

40.0%

30.7%

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Verified step by step guidance

First, determine the molar mass of dimethyl sulfoxide (C2H6SO). Calculate the molar mass by adding the atomic masses of all the atoms in the formula. Use the periodic table to find the atomic masses: Carbon (C) is approximately 12.01 g/mol, Hydrogen (H) is approximately 1.01 g/mol, Sulfur (S) is approximately 32.07 g/mol, and Oxygen (O) is approximately 16.00 g/mol.

Calculate the total molar mass of dimethyl sulfoxide (C2H6SO) using the formula: \( \text{Molar mass} = 2 \times \text{C} + 6 \times \text{H} + 1 \times \text{S} + 1 \times \text{O} \). Substitute the atomic masses into the equation: \( \text{Molar mass} = 2 \times 12.01 + 6 \times 1.01 + 32.07 + 16.00 \).

Next, calculate the mass of carbon in the compound. Since there are two carbon atoms in C2H6SO, multiply the atomic mass of carbon by 2: \( \text{Mass of carbon} = 2 \times 12.01 \).

To find the mass percentage of carbon in dimethyl sulfoxide, use the formula: \( \text{Mass percentage of carbon} = \left( \frac{\text{Mass of carbon}}{\text{Molar mass of C2H6SO}} \right) \times 100 \).

Finally, substitute the values obtained from the previous steps into the mass percentage formula and calculate the percentage. Round the result to three significant figures to find the mass percentage of carbon in dimethyl sulfoxide.