What is the molar mass of calcium carbonate (CaCO3)?

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Study for the Dual Enrollment Physical Science Midterm. Prepare with flashcards and multiple choice questions, and find explanations for each question. Get ready for your exam!

Multiple Choice

What is the molar mass of calcium carbonate (CaCO3)?

Explanation:
Molar mass is found by adding the atomic masses of every atom in the formula. CaCO3 has one calcium, one carbon, and three oxygens. Using standard atomic masses: Ca 40.08 g/mol, C 12.01 g/mol, O 16.00 g/mol. Three oxygens contribute 3 × 16.00 = 48.00 g/mol. Total: 40.08 + 12.01 + 48.00 = 100.09 g/mol. That value matches the correct choice. The other numbers are for different substances or miscounts (for example, 44.01 g/mol is CO2, and 40.00 g/mol is calcium alone).

Molar mass is found by adding the atomic masses of every atom in the formula. CaCO3 has one calcium, one carbon, and three oxygens. Using standard atomic masses: Ca 40.08 g/mol, C 12.01 g/mol, O 16.00 g/mol. Three oxygens contribute 3 × 16.00 = 48.00 g/mol. Total: 40.08 + 12.01 + 48.00 = 100.09 g/mol. That value matches the correct choice. The other numbers are for different substances or miscounts (for example, 44.01 g/mol is CO2, and 40.00 g/mol is calcium alone).

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