**Thermo: Calculate molar volume using steam tables and ideal gas law**
For water vapour, calculate the molar volume at 572 ºF 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 ºF, 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 ºF =573.15 ºK
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 ºK)= 85773.04=8.5x10(^4) metres cube
where: P= 145 psi (g)= 999739.80705 Pascals
1 Psi = 6 894.75729 Pascals
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Last edited by ariana; Nov 13th 2014 at 03:06 AM.
Reason: ADD INFO
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