C.V. Ammonia which is a control mass.
m2 = m1 = m ; m(u2 -u1) = 1Q2 -1 W2
State 2: x = 1.0, v2 = v1
=> V2 = mv2 = 0.1 m3
T2 = 30 + (0.1 – 0.11049) × 5/(0.09397 – 0.11049)
= 33.2 °C
u2 = 1338.7 kJ/kg; 1W2 = 0;
1Q2 = m1q2 = m(u2 – u1) = 1 (1338.7 – 978.9) = 359.8 kJ/kg