When $1 \ mol$ of a gas is allowed to expand freely in a vacuum,what is the work done during the process in Joules?

$A$ state function is .......

Fill in the blanks:
$(i)$ The process of attaining thermal equilibrium between any two heat-conducting bodies is called the $\dots\dots$ law of thermodynamics.
$(ii)$ The law of thermodynamics is actually the law of $\dots\dots$.
$(iii)$ $A$ thermometer measures temperature according to the $\dots\dots$ law of thermodynamics.

Explain the measurement of $\Delta U$ and $\Delta H$ by calorimetry.

The heat of reaction at constant pressure is given by

Two mole of an ideal gas is expanded isothermally and reversibly from $1 \ L$ to $10 \ L$ at $300 \ K$. The enthalpy change (in $kJ$) for the process is .....$kJ$