The evaporation of water is a:

Internal energy is an example of

Which of the following are extensive properties?

Which of the following statements is true about internal energy?

An ideal gas is expanded from $1 \times 10^{-3} \,m^3$ to $1 \times 10^{-2} \,m^3$ against a constant external pressure of $1 \times 10^5 \,N/m^2$ at $300 \,K$. The work done is

The species which by definition has $ZERO$ standard molar enthalpy of formation at $298 \ K$ is