Question 20 of 22 Incorrect Map Sapling Learning macmillan learning w much heat

Question

Question 20 of 22 Incorrect Map Sapling Learning macmillan learning w much heat energy is required to convert 55.6 g of solid ethanol at -114.5 °C to gasesous ethanol at 147.6 ? The molar heat of fusion of ethanol is 4.60 kJ/mol and its molar heat of vaporization is 38.56 kJ/mol point of 784 . The specific heat capacity Ethanol has a normal melting point of -114.5 °C and a normalboling point of 78.4 °C. The specific heat capacity of liquid ethanol is 2.45 J/g· and that of gaseous ethanol is 1.43 J/g· Number kJ Tools x 102 Previous Give Up & View Solution e Check Answer Next Exit XI Hint

Explanation / Answer

heat required(q) = n*DHfus + mliquid*Sliquid*DT2 + n*DHvap + mgas*Sgas*DT3

                 = (55.6/46)*4.6*10^3 + 55.6*2.45*(78.4-(-114.5)) + (55.6/46)*38.56*10^3 + 55.6*1.43*(147.6-78.4)

                 = 83.95 kj

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