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Using rounded atomic masses (Fe=56, O=16), what is the molar mass of iron(II) oxide (FeO)?

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A) 88 g/mol

B) 72 g/mol

C) 56 g/mol

D) 73 g/mol

Answer: B

Explanation: Molar mass is the sum of atomic masses multiplied by the number of each atom. For FeO, add 1×56 + 1×16 to obtain 72 g/mol.

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