The Addition of 125 Mg of Caffeine to 100 G

question 29

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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