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Practice question

MCQ

Question

A mixture of 2.3 g ethanol (C₂H₅OH) and 4.8 g methanol (CH₃OH) is dissolved in water to make 250 mL of solution. What is the total molarity of alcohols? (Molar masses: ethanol = 46 g/mol, methanol = 32 g/mol)

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Explanation

Moles of ethanol = 2.3/46 = 0.05 mol; moles of methanol = 4.8/32 = 0.15 mol. Total moles = 0.05 + 0.15 = 0.2 mol. Molarity = 0.2/0.25 = 0.8 M.

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