The Addition of 125 Mg of Caffeine to 100 G

question 88

Multiple Choice

The addition of 125 mg of caffeine to 100 g of cyclohexane lowered the freezing point by 0.13 K .Calculate the molar mass of caffeine.The k_f for cyclohexane is 20.1 K.kg.mol^-1.

• A) 47.8 g . mol ^{- 1}
• B) 481 g . mol ^{- 1}
• C) 96.5 g . mol ^{- 1}
• D) 19.3 g . mol ^{- 1}
• E) 193 g . mol ^{- 1}

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