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What is the difference between calculating work for a reversible and an irreversible process?
If a process is carried out reversibly, Pext can not be seen as a constant. Thus, the equotation becomes w= -nRT §1/V dV = -nRT (lnVf-lnVi)
If a perfect gas is expanded isothermally, what is U?
It is zero because the energy of a perfect gas only depends on its temperature.
How can you calculate the heat capacity c?
It's Cvm/R or (Cpm-R)/R
How can you calculate reversible adiabatic work?
It's w= n(Cpm-R)*(Tf-Ti)
How can you calculate irreversible work when only n, Cpm and T are given?
w= - n*Cpm*(Tf-Ti)
How can you calculate H from q?
It has the same value.
How does U relate to T?
U = nCvm * (Tf-Ti)