A substance undergoes a change represented as shown $\mathrm{A}\left(l\right)$ [1 bar, 300 K] $\to$ A(s) [1 bar, 300 K]. From the given information, calculate magnitude of change in internal energy (in Joules) when 1 mole of $\mathrm{A}\left(l\right)$ solidifies.

Information: 
(p) Standard melting point of $\mathrm{A}\left(\mathrm{s}\right)$ is 300 K. 
(q) Latent heat of fusion of A is 0.01 kJ/gm. 
(r) Specific volume of$\mathrm{A}\left(\mathrm{s}\right)$ is 100 ml/gm and $\mathrm{A}\left(l\right)$ is 120 ml/gm. 
(s) Molar mass of A is 50 gm / mole