Question

1Kg of real gas is heated from 18ºC to 93 ºC. Assuming Cv=1.466KJ/KgK. Then internal energy is ……

Answer 1

For real gas $U=\nu C_VT-a\nu^2/V$ . So, if $V=const$ then the change of

the internal energy of real gas is

$\Delta U= \nu C_V\Delta T=\frac{m}{M} c_VM\Delta T=m c_V\Delta T=$

$=1\cdot 1466\cdot(93°-18°)=109950\ (J)$ . Answer