Question
How the equation $\Delta U = q + w$ can be represented for isothermal reversible and irreversible process?
✓
Answer
Equation $(\Delta U = q + w )$ can be represented for isothermal reversible and irreversible process as follows :
(i) For isothermal irreversible process :
$
q=-w=p_{ex}\left(V_{f}-V_{i}\right)
$
(ii) For isothermal reversible process :
$
q=-w=n R T \ln \frac{V_f}{V_i}=2.303 n R T \log \frac{V_f}{V_i}
$
(iii) For adiabatic process: $q =0$
$
\Delta U=w_{ad}
$
(i) For isothermal irreversible process :
$
q=-w=p_{ex}\left(V_{f}-V_{i}\right)
$
(ii) For isothermal reversible process :
$
q=-w=n R T \ln \frac{V_f}{V_i}=2.303 n R T \log \frac{V_f}{V_i}
$
(iii) For adiabatic process: $q =0$
$
\Delta U=w_{ad}
$
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