During the isothermal expansion of an ideal gas,its enthalpy change is ......

For the reversible isothermal expansion of $1 \, \text{mol}$ of an ideal gas at $300 \, K$ from a volume of $10 \, dm^3$ to $20 \, dm^3$,the value of $\Delta H$ in $kJ$ is:

Which law of thermodynamics provides the definition of temperature?

For a chemical reaction,when does $\Delta H = \Delta U$ occur?

Which expression is correct for the work done in adiabatic reversible expansion of an ideal gas?

$1 \, mol$ of an ideal gas is compressed reversibly at a constant temperature of $27 \, ^oC$ from $1 \, bar$ to $4 \, bar$. Calculate the work done in $kJ$.