CHAPTER 2 PROPERTIES OF PURE SUBSTANCES 21 arigid tank contains 5kg of an ideal gas at aatm and 40C. Now a valve is opened, and half of mass of the gas is allowed to escape. If the final pressure in the tank is 1.5atm. the final temperature in the tank is [a]-38℃C[b]30℃C [c]40℃C [d]53℃C [e]144C 2.2A 5-m rigid vessel contains steam at 20 MPa and 400 C The mass of the steam is [a]5.0kg[b]0.322Kg[c]322kg[]503kg e680kgCHAPTER 2 PROPERTIES OF PURE SUBSTANCES 2.1 A rigid tank contains 5kg of an ideal gas at 4atm and 40℃.Now a valve is opened, and half of mass of the gas is allowed to escape .If the final pressure in the tank is 1.5atm.the final temperature in the tank is [a] -38 ℃ [b]30 ℃ [c]40 ℃ [d] 53 ℃ [e]144 ℃ 2.2 A rigid vessel contains steam at 20 MPa and 400 ℃.The mass of the steam is [a] 5.0kg [b] 0.322kg [c] 322kg [d] 503kg [e]680kg 3 5 − m