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

2. Atoms & Elements

Mole Concept

General Chemistry

2. Atoms & Elements

Mole Concept

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Multiple Choice

What is the mass of one molecule of NH₃ in grams?

1.50 x 10^-23 grams

4.50 x 10^-23 grams

3.40 x 10^-23 grams

2.82 x 10^-23 grams

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Verified step by step guidance

First, understand that the problem requires calculating the mass of a single molecule of NH₃ (ammonia) in grams. To do this, we need to use the molar mass of NH₃ and Avogadro's number.

Calculate the molar mass of NH₃. NH₃ consists of one nitrogen (N) atom and three hydrogen (H) atoms. Use the atomic masses: nitrogen is approximately 14.01 g/mol and hydrogen is approximately 1.01 g/mol. The molar mass of NH₃ is calculated as:

14.01 + 3 \times 1.01

Once you have the molar mass of NH₃, use Avogadro's number, which is

6.022 \times 10^23

molecules/mol, to find the mass of one molecule. The mass of one molecule is the molar mass divided by Avogadro's number.

Set up the equation to find the mass of one molecule:

\frac{molar mass}{Avogadro's number}

. Substitute the values you calculated for the molar mass and Avogadro's number.

Perform the division to find the mass of one molecule of NH₃ in grams. This will give you the mass of a single NH₃ molecule, which should match one of the provided options.