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Old Oct 1st 2014, 02:29 PM   #1
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Join Date: Oct 2014
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Smile Thermo: Calculate molar volume using steam tables and ideal gas law

For water vapour, calculate the molar volume at 572 F and 145 psi(g), using
the following two methods, steam tables and the ideal gas law. Is the water vapour
acting ideally? Molar mass of 18 g/mol for water

SOLUTION.
1. The problem statement, all variables and given/known data
Given T=572 F, pressure= 145 psi (g) using the steam tables and ideal gas law
Molar Mass= 18 g/mol for water
Find: Is the water vapour acting ideally?
2. Relevant equations
Ideal Gas Law: PV=nRT

P is the pressure =145 psi (g)
V is the molar volume
n= mol
R= Ideal gas constant 8.314 J(K^-1)(mol^-1)
T is temperature in kelvin, so temperature in farenheit= 572 F =573.15 K
How can I calculate the molar volume using the steam tables? and how can I know if the water vapour is acting ideally?


3. The attempt at a solution
Ideal gas law: PV= nRT
so: V= nRT/P= (18 mol)(8.314 JK^-1mol^-1)(573.15 K)= 85773.04=8.5x10(^4) metres cube
where: P= 145 psi (g)= 999739.80705 Pascals
1 Psi = 6 894.75729 Pascals

Last edited by ariana; Nov 13th 2014 at 03:06 AM. Reason: ADD INFO
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