Question

Ethanol (C2H5OHC2H5OH) melts at -114 ∘C∘C and boils at 78 ∘C∘C. The enthalpy of fusion of ethanol is 5.02 kJ/molkJ/mol, and its enthalpy of vaporization is 38.56 kJ/molkJ/mol. The specific heat of solid and liquid ethanol are 0.97 J/g⋅KJ/g⋅K are 2.3 J/g⋅KJ/g⋅K respectively.

Part A Part complete How much heat is required to convert 41.5 gg of ethanol at 21 ∘C∘C to the vapor phase at 78 ∘C∘C? Express your answer using two significant figures. QQ = 40 kJkJ SubmitPrevious Answers Correct Part B How much heat is required to convert 41.5 gg of ethanol at -157 ∘C∘C to the vapor phase at 78 ∘C∘C? Express your answer using two significant figures. Q = ? (KJ)

Answer 1

Part A: 40.2 kJ

Part B: 59.3 kJ