Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 36m
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

A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be:

NO₂

N₂O

N₂O₄

either NO₂ or N₂O₄

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Verified step by step guidance

Step 1: Begin by understanding the problem. We need to determine which molecular formula corresponds to a nitrogen oxide that is 63.65% nitrogen by mass.

Step 2: Calculate the molar mass of each compound option. For example, for NO, calculate the molar mass using the atomic masses of nitrogen (N) and oxygen (O). Use the formula: \( \text{Molar Mass} = \text{Atomic Mass of N} + \text{Atomic Mass of O} \).

Step 3: Determine the mass percentage of nitrogen in each compound. Use the formula: \( \text{Mass Percentage of N} = \left( \frac{\text{Mass of N in the compound}}{\text{Molar Mass of the compound}} \right) \times 100 \).

Step 4: Compare the calculated mass percentage of nitrogen for each compound with the given percentage (63.65%). Identify which compound has a nitrogen mass percentage closest to 63.65%.

Step 5: Conclude which molecular formula matches the given nitrogen mass percentage. The correct formula will have a nitrogen mass percentage that matches or is very close to 63.65%.