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Using rounded atomic masses (C=12, H=1), what is the molar mass of ethyne (C2H2)?

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A) 42 g/mol

B) 10 g/mol

C) 26 g/mol

D) 27 g/mol

Answer: C

Explanation: Molar mass is the sum of atomic masses multiplied by the number of each atom. For C2H2, add 2×12 + 2×1 to obtain 26 g/mol.

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