A mass of 0.02 kg of steam with x1 = 0.8 is contained in the cylinder of

Question:

A mass of 0.02 kg of steam with x1 = 0.8 is contained in the cylinder of Fig. 2.33. The spring with spring constant K = 60 kN/m just touches the top of the frictionless 160-kg piston. Heat is added until the temperature reaches 800°C. Estimate the final pressure of the steam. A trial-and-error procedure may be necessary.
Figure 2.33