How much time will take before methane become single phase

Question

Problem

1. A sealed, rigid vessel of 2 m³ contains a saturated mixture of liquid and vapor R-134a at 10^oC. If it is heated to 50^oC, the liquid phase disappears. Find the pressure at 50^oC and the initial mass of the liquid.

2. A storage tank holds methane at 120 K, with a quality of 25%, and it warms up by 5^oC per hour due to a failure in the refrigeration system. How much time will it take before the methane becomes single phase, and what is the pressure then?

The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.