Q9)

A small perturbation is applied to 0.1 kg supercooled water at 268 K under standard pressure. This initialized the freezing of supercooled water to ice, which let the temperature of system rise to 273 K. The process can be considered as adiabatic. The heat of fusion of ice is 333.5 kJkg-1. Heat capacity of water is 4.21 kJkg-1K-1 in 268-273 K.

(1) calculate of this process (2) Calculate the weight of ice in the final state.

10.)Calculate the standard molar formation enthalpy of ethyl acetate fm(325, , 298.15), with following data:

3() + 25() = 325() + 2()

rm(298.15 ) = 9.20 1

The standard molar enthalpy of combustion of acetic acid is -874.54 kJmol-1. The standard molar enthalpy of combustion of ethanol is -1366 kJmol-1. The standard molar enthalpy of combustion of H2O(l) is 0 kJmol-1. The standard molar enthalpy of formation of CO2(g) is -393.51 kJmol-1.

The standard molar enthalpy of formation of H2O(l) is -285.83 kJmol-1.