The temperature of an ideal gas increases in an :

The work done by a system is $8 \mathrm{J},$ when $40 \mathrm{J}$ heat is supplied to it. The change in internal energy of the system during the process is:

The difference between heats of reaction at constant pressure and constant volume for the reaction,

$2{\mathrm{C}}_6{\mathrm{H}}_6 \left(\mathrm{l}\right)+15{\mathrm{O}}_2 \left(\mathrm{g}\right) \to 12{\mathrm{CO}}_2 \left(\mathrm{g}\right) + 6{\mathrm{H}}_2\mathrm{O} \left(\mathrm{l}\right)$ at $25°\mathrm{C}$ in $\mathrm{kJ}$ is: