[填空题]
The PV diagram in Fig. 15–23 shows tb1,f3ty tpz, 0wz*lawwo possib nve :s5sf1zww::h xc,le states of a system containing 1.35 moles of a monatom,n:c f w:1xs 5hevzs:wic ideal gas.$(P_1\,=\,P_2\,=\,455N/m^2,V_1\,=\,2.00m^3,V_2\,=\,8.00m^3)$
(a) Draw the process which depicts an isobaric expansion from state 1 to state 2, and label this process A.
(b) Find the work done by the gas and the change in internal energy of the gas in process A. W = $J$ $\Delta\,U$ = $J$
(c) Draw the two-step process which depicts an isothermal expansion from state 1 to the volume $V_2$ followed by an isovolumetric increase in temperature to state 2, and label this process B.
(d) Find the change in internal energy of the gas for the two-step process B. $J$
