(a) The heat of fusion of ether (C2H5OC2H5) at its normal melting point of 116C is 7.3kJ/mol, while its heat of vaporization at its normal boiling point of 35C is 26.5kJ/mol. Use these data to calculate the heat of sublimation for C2H5OC2H5. kJ/mol Is your answer precise or is it approximate? (b) At 298K, the standard heat of formation of C2H5OC2H5(I) is 280.0kJ/mol while the standard heat of formation of C2H5OC2H5(g) is 252.0kJ/mol. Use this to calculate the heat of vaporization of ether. kJ/mol Is your result for part (b) larger or smaller than the value given in the statement of the