A liquid R-134-a bottle has an internal volume of. 0.001 m3. Initially it contains 0.4 kg of R-134a (saturated mixture) at 26°C. A valve is opened and R-134-a vapor only (no liquid) is allowed to escape slowly such that temperature remains constant until the mass of the R-134 a remaining is 0.1 kg.Find the heat transfer necessary with the surroundings to maintain the temperature and pressure of the R-134a constant.