Use the enthalpies of formation in the table below to answer thefollowing questions.
Substance | Enthalpy of Formation (kJ/mol), 298 K |
Oxygen (O2)(g) | 0 |
Methane (CH4)(g) | -74.8 |
Carbon Dioxide (CO2)(g) | -393.5 |
Water (H2O)(g) | -241.8 |
Water (H2O)(l) | -285.8 |
A) Calculate the change in enthalpy for the combustion ofmethane using the values in the table above (assuming that thesystem remains at 298 K) for the combustion of methane to formcarbon dioxide and gaseous water.
B) Repeat this calculation assuming that the product is liquidwater.
C) Explain what this difference represents.
