In an irreversible expansion of a gas,the work done by the gas is given by.....

For which of the following reactions,$\Delta H$ is equal to $\Delta U$ ?

Evaporation of water is

What is the work done when a gas is compressed from $2.5 \times 10^{-2} \ m^3$ to $1.3 \times 10^{-2} \ m^3$ at a constant external pressure of $4.05 \ bar$ (in $J$)?

Which of the following sets represents the normal physical states of the elements concerned at $25\,^{\circ}C$ and $1 \ bar$ pressure,for which $\Delta H^{\circ}_{f} = 0$?

The heat content of a system is called