Question

A 2.4 mol of ideal gas through an isochoric process in which the process in which the pressure changes from 1.8 atm to 2.9 atm at 200k. The specific heat of a gas at constant volume is 12.47j/mol.k . What was the initial temperature and the internal energy of the system?

Answer 1

$$T_2=T_1\frac{p_2}{p_1}\\ T_1=200\frac{1.8}{2.9}=124\ K$$

$$U_1=2.4(12.47)(124)=3711\ J$$