- #1
Quelsita
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Question:
One mole of an ideal gas with cv=2.5R, initially at 0.0degC, is heated at constant pressure. How much heat is needed to double its volume?
Solution:
Know:
n=1
T0=273.15K
cv=2.5R
[tex]\Delta[/tex]P=0
Vf=2V0
H=U +PV
and thus, Q= [tex]\Delta[/tex]H
Q=ncv[tex]\Delta[/tex]T
We can rearrange to find
[tex]\Delta[/tex]H=[tex]\Delta[/tex]U +P(2V0-V0) -> since Vf=2V0
My question is, what do I do with the internal energy? and how can I find the pressure with the given information if I also don't know the final temp?
One mole of an ideal gas with cv=2.5R, initially at 0.0degC, is heated at constant pressure. How much heat is needed to double its volume?
Solution:
Know:
n=1
T0=273.15K
cv=2.5R
[tex]\Delta[/tex]P=0
Vf=2V0
H=U +PV
and thus, Q= [tex]\Delta[/tex]H
Q=ncv[tex]\Delta[/tex]T
We can rearrange to find
[tex]\Delta[/tex]H=[tex]\Delta[/tex]U +P(2V0-V0) -> since Vf=2V0
My question is, what do I do with the internal energy? and how can I find the pressure with the given information if I also don't know the final temp?