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The standard enthalpy of formation of gaseous H2O at 298 K is -241.82 kJ mol-1. Estimate its value at 75 °C given the following values of the molar heat capacities at constant pressure:

i. Cp [H2O(g)] = 33.58 J K-1 mol-1

ii. Cp [H2(g)] = 28.84 J K-1 mol-1

iii. Cp [O2(g)] = 29.37 J K-1 mol-1

Assume that the heat capacities are independent of temperature.

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