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

Stoichiometry

General Chemistry

3. Chemical Reactions

Stoichiometry

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Multiple Choice

What is the formula mass of calcium nitrate, Ca(NO₃)₂?

102.1 amu

164.1 amu

204.2 amu

150.1 amu

none of the above

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Verified step by step guidance

Identify the chemical formula of calcium nitrate, which is Ca(NO₃)₂.

Determine the atomic masses of each element in the compound: Calcium (Ca) has an atomic mass of approximately 40.08 amu, Nitrogen (N) has an atomic mass of approximately 14.01 amu, and Oxygen (O) has an atomic mass of approximately 16.00 amu.

Calculate the total mass contributed by the calcium atom: Since there is one calcium atom, multiply its atomic mass by 1: 40.08 amu.

Calculate the total mass contributed by the nitrate ions: Each nitrate ion (NO₃) contains one nitrogen atom and three oxygen atoms. Calculate the mass of one nitrate ion: (1 x 14.01 amu) + (3 x 16.00 amu). Then, since there are two nitrate ions, multiply the mass of one nitrate ion by 2.

Add the mass of the calcium atom to the total mass of the two nitrate ions to find the formula mass of calcium nitrate, Ca(NO₃)₂.