So, the problem is: A 200-gram sample of dry air is heated isobarically. Its entropy increases by 19.2 J/K and the work done by expansion is 1.61x103 J. Solve for the final temperature of the air. Okay, since p=const => dq=CpdT thus instead of dq=du+dw we can write dq=dq(Cv/Cp)+dw can find dq=460.46 So i know dq,du,dw,d[tex]\phi[/tex], but how do I get final temperature? All I can find is dT but it's useless sine I don't know initial temperature. And where do I put mass and how to use the d[tex]\phi[/tex]=dq/T formula? Looks like it will be needed here... Thanks a lot in advance!