Ethanol (C₂H₅OH)melts at -114°C

question 21

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 kJ
• B)-12.7 kJ
• C)6.91 kJ
• D)4192 kJ
• E)9.21 kJ

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