When a 491-G Sample of an Unknown Compound Is Dissolved in 500

question 47

Multiple Choice

When a 49.1-g sample of an unknown compound is dissolved in 500.g of benzene,the freezing point of the resulting solution is 3.77°C.The freezing point of pure benzene is 5.48°C and K_f for benzene is 5.12°C/m.Calculate the molar mass of the unknown compound.

• A)147 g/mol
• B)28.7 g/mol
• C)251 g/mol
• D)588 g/mol
• E)294 g/mol

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