Ethanol (C₂H₅OH)melts at -114 °C. The enthalpy of fusion is 5.02 kJ mol^-1. The specific heats of solid and liquid ethanol are 0.97 J g^-1 °C^-1 and 2.3 J g^-¹ °C^-1, 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

Question

Quizplus · Accepted Answer

To find the total heat required, calculate the heat needed to warm the solid ethanol from -135 °C to -114 °C, the heat needed for the phase change at -114 °C, and the heat needed to warm the liquid ethanol from -114 °C to -50 °C. The total heat is the sum of these three amounts.

Ethanol (C2H5OH)melts at -114 °C

Ethanol (C₂H₅OH)melts at -114 °C