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Nick_273
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Homework Statement
One mole of a monatomic ideal gas is transformed from 0.00°C and 2.00 atm to
-40.0°C and 0.400 atm. Show that this is NOT an adiabatic reversible expansion and
calculate ΔS for the change. (Hint: you will need to consider a reversible path that
includes a constant pressure step and a constant temperature step.)
Homework Equations
ΔU=q+w
pV=nRT
ΔS=nC(p,m)ln(Vf/Vi)
The Attempt at a Solution
For adiabatic reversible expansion, q=0, so i have to show that q= a number.
Found Vi= 11.2L and Vf=47.8L via ideal gas law
ΔS=(1mol)(5/2(8.314J/Kmol)ln(47.2/11.2)
=30.15J/K
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