my professor did a problem in class. Part of the question was \"a system consist

Question

my professor did a problem in class. Part of the question was "a system consists of 2 kg of water and a process occures. PV = C from saturated vapor at 10 mpa to 1 mpa". he solved by finding saturated V1 then applying P1*V1 = P2*V2 to find V2. I did this wrong because I thought because PV = C that this ment T1=T2. So I found T1sat from the superheated vapor tables for P1. and then looked up P2 superheated water table to find that T1sat V2 was something different then what he says (his way is inside the saturation dome mine was a superheated vapor). Please someone help!

Explanation / Answer

Well...i appreciate that you are trying to trying new things. The mistake in your method is you are assuming , PV=nRT for both the cases, but for water- vapor system, the equation doesn't hold. PV=nRT is ideal gas equation and saturated vapor mixture is far from ideal gas.

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