I think a and b are right but please do part c

A closed, rigid tank contains a two-phase liquid-vapor mixture of Refrigerant-22 initially at -20C with a quality of 50.36%. Energy transfer by heat into the tank occurs until the refrigerant is at a final pressure of 6 bar. Determine the final temperature, in C. If the final state is in the superheated vapor region, at what temperature, in C, does the tank contain only saturated vapor? (a). The final temperature is 43.75 C (b). The temperature at which the tank contain only saturated vapor is 0 C (c). The amount of energy transfer by heat is [Math Error]