A refrigeration system uses R-410a as the refrigerant. The system is evacuated, then charged with refrigerant at a constant temperature of 20°C. The system volume is at 0.018 m3. Determine (a) the pressure and quality when the system holds 1.2 kg of R-410a and (b) The mass of R-410a in the system when the pressure is 200 kPa.