Question

A 1 kg steamActivity 2 0 water mixture at 1.0 MPa is contained in an inflexible tank. Heat is added until the pressure rises to 3.5 MPa and 400 C. Determine the heat added

Answer 1

$m = 1 kg\\ P_1 = 1.0\ MPa\\ P_2 = 3.5\ MPa\\ U_1 = 2401.41\frac{ kJ} {kg}\\ U_2= 2926.4 \frac{ kJ} {kg}\\ T = 400°C$
Heat transferred = $m(U_2-U_1) =$$1(2926.4-2401.41) = 524.99$$= 524.99 kJ$