Ethanol (C₂H₅OH)melts at -114°C

question 30

Multiple Choice

Ethanol (C₂H₅OH) melts at -114°C. The enthalpy of fusion is 5.02 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K, respectively. How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -135°C to liquid ethanol at -50°C?

• A)207.3
• B)-12.7
• C)6.91
• D)4192
• E)9.21

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