Two moles of an ideal gas expand freely and isothermally from $5 \ dm^3$ to $50 \ dm^3$. What is the value of $\Delta H$?

Among the following,the state function$(s)$ is(are):
$A$. Internal energy
$B$. Irreversible expansion work
$C$. Reversible expansion work
$D$. Molar enthalpy

The enthalpies of the elements in their standard states are assumed to be

At a definite temperature,for which of the following reactions will the value of $(\Delta E - \Delta H)$ be maximum?

The difference between $C_p$ and $C_v$ can be derived using the empirical relation $H = U + PV$. Calculate the difference between $C_p$ and $C_v$ for $10$ moles of an ideal gas.

For which of the following systems, the difference between $\Delta H$ and $\Delta U$ is not significant?
$(i)$ Solids
$(ii)$ Gases
$(iii)$ Mixture of gases and liquids
$(iv)$ Liquids