For the gaseous reaction,$N_2O_4(g) \to 2NO_2(g)$,which of the following relations is correct?

If $1.5 \ L$ of an ideal gas at a pressure of $20 \ atm$ expands isothermally and reversibly to a final volume of $15 \ L$,the work done by the gas in $L \ atm$ is

Which of the following expressions represents the first law of thermodynamics?

The heat change for the following reaction at $298 \ K$ and at constant pressure is $+7.3 \ kcal$: $A_2B_{(s)} \to 2A_{(s)} + 1/2B_{2(g)}$,$\Delta H = +7.3 \ kcal$. The heat change at constant volume would be:

In a particular reaction, $4 \text{ kJ}$ of heat is released by the system and $12 \text{ kJ}$ of work is done on the system. Calculate the $\Delta H$ and $\Delta U$.

In a process,$605 \ J$ of heat is absorbed by the system and $380 \ J$ of work is done by the system on the surroundings. What is the value of $\Delta U$?