The standard enthalpy of formation of gaseous water is -241.82 kJ.mol^-1 at 298 K.Estimate this value at 370 K.The molar heat capacities of hydrogen,oxygen,and gaseous water are 28.82,29.36,and 33.58 J.K ^- ¹.mol ^- ¹.

Question

Quizplus · Accepted Answer

The change in enthalpy with temperature can be estimated using the heat capacities. The enthalpy change from 298 K to 370 K is calculated using the heat capacities of the reactants and products. The difference in heat capacities is used to adjust the standard enthalpy of formation from 298 K to 370 K, resulting in an estimated value of -242.54 kJ/mol.

The Standard Enthalpy of Formation of Gaseous Water Is -241