Molar Mass Worksheet Answer Key

Struggling to master molar mass calculations? You’re not alone! Understanding molar mass is a fundamental concept in chemistry, crucial for everything from stoichiometry to solution preparation. Many students find the process daunting at first, which is why worksheets are so helpful. They provide structured practice, allowing you to apply the concepts you’ve learned and identify areas where you might need further clarification. But after working through a molar mass worksheet, the real learning happens when you check your answers and understand *why* you got them right or wrong. That’s where the answer key comes in – it’s more than just a list of numbers; it’s your guide to mastering the concept.

Think of the molar mass worksheet as your training ground and the answer key as your coach. The worksheet presents the challenges, forcing you to recall formulas, use the periodic table effectively, and perform calculations accurately. The answer key then provides immediate feedback, allowing you to correct your mistakes and reinforce correct procedures. By carefully reviewing the answer key, you can pinpoint the source of your errors – were you using the wrong atomic masses from the periodic table? Did you incorrectly sum the individual atomic masses? Did you forget to account for subscripts within the chemical formula? Understanding these errors is the key to improving your problem-solving skills and building a solid foundation in chemistry.

The purpose of this post is to provide a comprehensive Molar Mass Worksheet Answer Key. However, it’s crucial to remember that simply copying the answers will not help you learn. Instead, use this key as a tool to check your work *after* you’ve attempted the problems yourself. Compare your calculations step-by-step with the provided answers to identify discrepancies and understand the correct approach. This active learning process will significantly enhance your understanding of molar mass and improve your overall performance in chemistry.

Below you will find the answers to common molar mass worksheet problems. Remember to show your work when solving these problems yourself! Check your answers against the key and analyze your mistakes to improve your understanding.

Common Compounds

1. H₂O (Water)
- Molar mass: 18.02 g/mol
- Explanation: (2 x H atomic mass) + (1 x O atomic mass) = (2 x 1.01 g/mol) + (1 x 16.00 g/mol) = 18.02 g/mol
2. NaCl (Sodium Chloride)
- Molar mass: 58.44 g/mol
- Explanation: (1 x Na atomic mass) + (1 x Cl atomic mass) = (1 x 22.99 g/mol) + (1 x 35.45 g/mol) = 58.44 g/mol
3. CO₂ (Carbon Dioxide)
- Molar mass: 44.01 g/mol
- Explanation: (1 x C atomic mass) + (2 x O atomic mass) = (1 x 12.01 g/mol) + (2 x 16.00 g/mol) = 44.01 g/mol
4. C₆H₁₂O₆ (Glucose)
- Molar mass: 180.18 g/mol
- Explanation: (6 x C atomic mass) + (12 x H atomic mass) + (6 x O atomic mass) = (6 x 12.01 g/mol) + (12 x 1.01 g/mol) + (6 x 16.00 g/mol) = 180.18 g/mol
5. H₂SO₄ (Sulfuric Acid)
- Molar mass: 98.08 g/mol
- Explanation: (2 x H atomic mass) + (1 x S atomic mass) + (4 x O atomic mass) = (2 x 1.01 g/mol) + (1 x 32.07 g/mol) + (4 x 16.00 g/mol) = 98.08 g/mol

Compounds with Polyatomic Ions

6. Ca(OH)₂ (Calcium Hydroxide)
- Molar mass: 74.10 g/mol
- Explanation: (1 x Ca atomic mass) + (2 x O atomic mass) + (2 x H atomic mass) = (1 x 40.08 g/mol) + (2 x 16.00 g/mol) + (2 x 1.01 g/mol) = 74.10 g/mol
7. (NH₄)₂SO₄ (Ammonium Sulfate)
- Molar mass: 132.14 g/mol
- Explanation: (2 x N atomic mass) + (8 x H atomic mass) + (1 x S atomic mass) + (4 x O atomic mass) = (2 x 14.01 g/mol) + (8 x 1.01 g/mol) + (1 x 32.07 g/mol) + (4 x 16.00 g/mol) = 132.14 g/mol
8. AlPO₄ (Aluminum Phosphate)
- Molar mass: 121.95 g/mol
- Explanation: (1 x Al atomic mass) + (1 x P atomic mass) + (4 x O atomic mass) = (1 x 26.98 g/mol) + (1 x 30.97 g/mol) + (4 x 16.00 g/mol) = 121.95 g/mol

Hydrates

9. CuSO₄•5H₂O (Copper(II) Sulfate Pentahydrate)
- Molar mass: 249.68 g/mol
- Explanation: (1 x Cu atomic mass) + (1 x S atomic mass) + (9 x O atomic mass) + (10 x H atomic mass) = (1 x 63.55 g/mol) + (1 x 32.07 g/mol) + (9 x 16.00 g/mol) + (10 x 1.01 g/mol) = 249.68 g/mol
10. MgSO₄•7H₂O (Magnesium Sulfate Heptahydrate)
- Molar mass: 246.48 g/mol
- Explanation: (1 x Mg atomic mass) + (1 x S atomic mass) + (11 x O atomic mass) + (14 x H atomic mass) = (1 x 24.31 g/mol) + (1 x 32.07 g/mol) + (11 x 16.00 g/mol) + (14 x 1.01 g/mol) = 246.48 g/mol

Remember to always double-check your calculations and use the correct atomic masses from the periodic table. Good luck!

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