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Using rounded atomic masses (H=1, P=31, O=16), what is the molar mass of phosphoric acid (H3PO4)?

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A) 114 g/mol

B) 98 g/mol

C) 82 g/mol

D) 99 g/mol

Answer: B

Explanation: Molar mass is the sum of atomic masses multiplied by the number of each atom. For H3PO4, add 3×1 + 1×31 + 4×16 to obtain 98 g/mol.

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