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sac.lalit
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Homework Statement
Equation for the substance given for a certain range of pressure and temperature:
v=(RT/p) - C/T3
Where C=Constant
Show that
(i) The change of enthalpy for this substance in an isothermal process is
(h2-h1)T=4C/T3(p1-p2)T
(ii) The change of entropy for this substance in an isothermal process is
(S2-S1)T=Rln(p1/p2)+3C/T4(p1-p2)T
The Attempt at a Solution
taking h=U+pv
dh=du+d(pv) {du=0 for isothermal process}
dh=d(pv)=-Cdp/T3
but result which i need to show has factor 4 also; which i have no idea how to get.