Chapter 12, Problem 82AP

Nitromethane, ${\text{CH}}_{\text{3}}{\text{NO}}_{\text{2}},$ is a good fuel. It is a liquid at ordinary temperatures. When the liquid is burned, the reaction involved is chiefly
$2{\text{CH}}_{\text{3}}{\text{NO}}_{\text{2}}\left(\mathcal{l}\right)+\frac{3}{2}{\text{O}}_{\text{2}}\left(g\right)\to 2{\text{CO}}_{\text{2}}\left(g\right)+{\text{N}}_{\text{2}}\left(g\right)+3{\text{H}}_{\text{2}}\text{O}\left(g\right)$
The standard enthalpy of formation of liquid nitromethaneat 25°C is $-112\text{kJ}{\text{mol}}^{-1};$ other relevant values can be found in Appendix D.

1. Calculate the enthalpy change in the burning of 1 molliquid nitromethane to form gaseous products at25°C. State explicitly whether the reaction is endothermicor exothermic.
2. Would more or less heat be evolved if gaseous nitromethanewere burned under the same conditions?Indicate what additional information (if any) you would need to calculate the exact amount of heat, and show just how you would use this information.