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Using rounded atomic masses (K=39, Cl=35.5), what is the molar mass of potassium chloride (KCl)?

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A) 90.5 g/mol

B) 74.5 g/mol

C) 58.5 g/mol

D) 75.5 g/mol

Answer: B

Explanation: Molar mass is the sum of atomic masses multiplied by the number of each atom. For KCl, add 1×39 + 1×35.5 to obtain 74.5 g/mol.

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