26. (2 points) ____ Find a false statement regarding isobaric process of N-molecule gas.
(a) The work done by the gas consisting of N molecules is
$\Delta W = p \Delta V = \Delta (pV) = Nk_B \Delta T$.
(b) The internal energy is $E_{int} = \frac{3}{2}Nk_BT$, $\frac{5}{2}Nk_BT$, and $3Nk_BT$ for monatomic, diatomic, and polyatomic molecules, respectively.
(c) During a constant-pressure process the work done by the gas is always positive.
(d) The heat capacity $C_p$ at constant pressure $\frac{5}{2}Nk_B$, $\frac{7}{2}Nk_B$, and $4Nk_B$ for monatomic, diatomic, and polyatomic molecules, respectively.
