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Using rounded atomic masses (Mg=24, C=12, O=16), what is the molar mass of magnesium carbonate (MgCO3)?

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A) 100 g/mol

B) 68 g/mol

C) 84 g/mol

D) 85 g/mol

Answer: C

Explanation: Molar mass is the sum of atomic masses multiplied by the number of each atom. For MgCO3, add 1×24 + 1×12 + 3×16 to obtain 84 g/mol.

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