Molar Mass Practice Worksheet featuring ten chemical compounds for calculating molar masses.

Let's solve each of these molar mass problems step by step. The molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). We calculate it by summing the atomic masses of all atoms in the compound using the periodic table.

We'll use standard atomic masses (rounded to two decimal places):

- H = 1.01 g/mol
- C = 12.01 g/mol
- N = 14.01 g/mol
- O = 16.00 g/mol
- F = 19.00 g/mol
- Na = 22.99 g/mol
- Mg = 24.31 g/mol
- Al = 26.98 g/mol
- P = 30.97 g/mol
- S = 32.07 g/mol
- Cl = 35.45 g/mol
- K = 39.10 g/mol
- Ca = 40.08 g/mol
- Cr = 52.00 g/mol
- Mn = 54.94 g/mol
- Fe = 55.85 g/mol
- Co = 58.93 g/mol
- Ni = 58.69 g/mol
- Cu = 63.55 g/mol
- Zn = 65.38 g/mol
- Br = 79.90 g/mol
- Rb = 85.47 g/mol
- Sr = 87.62 g/mol
- Ag = 107.87 g/mol
- Cd = 112.41 g/mol
- I = 126.90 g/mol
- Pb = 207.2 g/mol

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1) NaBr

- Na: 22.99 g/mol
- Br: 79.90 g/mol
Molar mass = 22.99 + 79.90 = 102.89 g/mol

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2) PbSO₄

- Pb: 207.2 g/mol
- S: 32.07 g/mol
- O₄: 4 × 16.00 = 64.00 g/mol
Molar mass = 207.2 + 32.07 + 64.00 = 303.27 g/mol

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3) Ca(OH)₂

- Ca: 40.08 g/mol
- O₂: 2 × 16.00 = 32.00 g/mol
- H₂: 2 × 1.01 = 2.02 g/mol
Molar mass = 40.08 + 32.00 + 2.02 = 74.10 g/mol

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4) Na₃PO₄

- Na₃: 3 × 22.99 = 68.97 g/mol
- P: 30.97 g/mol
- O₄: 4 × 16.00 = 64.00 g/mol
Molar mass = 68.97 + 30.97 + 64.00 = 163.94 g/mol

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5) (NH₄)₂CO₃

- N₂: 2 × 14.01 = 28.02 g/mol
- H₈: 8 × 1.01 = 8.08 g/mol
- C: 12.01 g/mol
- O₃: 3 × 16.00 = 48.00 g/mol
Molar mass = 28.02 + 8.08 + 12.01 + 48.00 = 96.11 g/mol

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6) C₆H₁₂O₆ (Glucose)

- C₆: 6 × 12.01 = 72.06 g/mol
- H₁₂: 12 × 1.01 = 12.12 g/mol
- O₆: 6 × 16.00 = 96.00 g/mol
Molar mass = 72.06 + 12.12 + 96.00 = 180.18 g/mol

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7) Fe₃(PO₄)₂

- Fe₃: 3 × 55.85 = 167.55 g/mol
- P₂: 2 × 30.97 = 61.94 g/mol
- O₈: 8 × 16.00 = 128.00 g/mol
Molar mass = 167.55 + 61.94 + 128.00 = 357.49 g/mol

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8) (NH₄)₂S

- N₂: 2 × 14.01 = 28.02 g/mol
- H₈: 8 × 1.01 = 8.08 g/mol
- S: 32.07 g/mol
Molar mass = 28.02 + 8.08 + 32.07 = 68.17 g/mol

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9) Zn(C₂H₃O₂)₂

This is zinc acetate.
- Zn: 65.38 g/mol
- C₄: 4 × 12.01 = 48.04 g/mol
- H₆: 6 × 1.01 = 6.06 g/mol
- O₄: 4 × 16.00 = 64.00 g/mol
Molar mass = 65.38 + 48.04 + 6.06 + 64.00 = 183.48 g/mol

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10) AgF

- Ag: 107.87 g/mol
- F: 19.00 g/mol
Molar mass = 107.87 + 19.00 = 126.87 g/mol

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✔ Final Answers:

1) NaBr: 102.89 g/mol
2) PbSO₄: 303.27 g/mol
3) Ca(OH)₂: 74.10 g/mol
4) Na₃PO₄: 163.94 g/mol
5) (NH₄)₂CO₃: 96.11 g/mol
6) C₆H₁₂O₆: 180.18 g/mol
7) Fe₃(PO₄)₂: 357.49 g/mol
8) (NH₄)₂S: 68.17 g/mol
9) Zn(C₂H₃O₂)₂: 183.48 g/mol
10) AgF: 126.87 g/mol

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