- #1
KKAK
- 11
- 0
Hi all , I have 2 questions, I don't know how to derive the equations, please help.
Thank you.
1)A reversible adiabatic expansion of 2.5 moles or He from a volume 9L at 300K to a final volume of 28L.
Find work(W), heat(Q), internal energy(U) and enthalpy change(H) and final temperature. (He is a monatomic ideal gas)
2)A reversible isobaric expansion of an ideal gas from P1,V1,T1 to P1,V2,T2, assume Cv = 5/2nR
Find W, change in internal energy, Heat and enthalpy.
I know for #1 heat = 0, therefore delta U = W = integral P*dV, but I don't know since we don't know pressure , I don't know how to continue.
For #2, it is constant pressure, therefore W= -P*delta V
delta U = Q - (p*delta V)
Q = delta U + (p*delta V) = enthalpy
Am I right ? it looks so weird, I need some help thanks !
Thank you.
1)A reversible adiabatic expansion of 2.5 moles or He from a volume 9L at 300K to a final volume of 28L.
Find work(W), heat(Q), internal energy(U) and enthalpy change(H) and final temperature. (He is a monatomic ideal gas)
2)A reversible isobaric expansion of an ideal gas from P1,V1,T1 to P1,V2,T2, assume Cv = 5/2nR
Find W, change in internal energy, Heat and enthalpy.
I know for #1 heat = 0, therefore delta U = W = integral P*dV, but I don't know since we don't know pressure , I don't know how to continue.
For #2, it is constant pressure, therefore W= -P*delta V
delta U = Q - (p*delta V)
Q = delta U + (p*delta V) = enthalpy
Am I right ? it looks so weird, I need some help thanks !