Hi guys. I am trying this question for 2 days.I managed to solve the second question but the 2nd question I don't know.Can someone help me out.If possible please really really guide me the steps for the working and solution for the question so that I no need to crack my head figuring out by just giving partial solution. Therefore please show me the working/steps for the solution for this question. I ONLY NEED HELP ON 1ST QUESTION BCOZ 2nd QUESTION I MANAGED TO DO it BY MYSELF. Btw the question is follow as :

1)Determine the mass flow rate and temperature of the air at the exit of the adiabatic
Device shown.(Refer to the attachment for the diagram for this question)

2)Consider an evacuated rigid bottle of volume V that is surrounded by the atmosphere at pressure P0 and temperature T0. A valve at the neck of the bottle is now opened and the atmospheric air is allowed to flow into the bottle. The air trapped in the bottle eventually reaches thermal equilibrium with the atmosphere as a result of heat transfer through the wall of the bottle. The valve remains open during the process so that the trapped air also reaches mechanical equilibrium with the atmosphere. Determine the net heat transfer through the wall of the bottle during this filling process in terms of the properties of the system and the surrounding atmosphere.

So guys please really help me out. I am just hoping you guys.If can, could you please tell me where this 1st question taken from ? Example from which books or site this question taken from because so that I can buy the book which has similar question like this and I can practice more question on that.Last but not least, thank you very much for your concern for those who are helping me