Question
Which of the following statements/relationships is not correct in thermodynamic changes?
A.
$$\Delta U = 0$$ ( isothermal reversible expansion of a gas )
B.
$$w = - nRT\,\,{\text{ln}}\,\,\frac{{{V_2}}}{{{V_1}}}$$ ( isothermal reversible expansion of an ideal gas )
C.
$$w = nRT\,\,{\text{ln}}\,\,\frac{{{V_2}}}{{{V_1}}}$$ ( isothermal reversible
expansion of an ideal gas )
D.
For a system of constant volume heat involved directly changes to internal energy.
Answer :
$$w = nRT\,\,{\text{ln}}\,\,\frac{{{V_2}}}{{{V_1}}}$$ ( isothermal reversible
expansion of an ideal gas )
Solution :
For isothermal reversible expansion.
$$w = - nRT\,\,{\text{ln}}\,\,\frac{{{V_2}}}{{{V_1}}}$$