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Using rounded atomic masses (K=39, C=12, O=16), what is the molar mass of potassium carbonate (K2CO3)?

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A) 138 g/mol

B) 154 g/mol

C) 122 g/mol

D) 139 g/mol

Answer: A

Explanation: Molar mass is the sum of atomic masses multiplied by the number of each atom. For K2CO3, add 2×39 + 1×12 + 3×16 to obtain 138 g/mol.

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