(1)0.75atm;(2)2L 试题分析:由图象可知,T B =273+91=364K,p B =1atm,T A =273K,A到B过程为等容过程,由查理定律得: ,得气体在状态A的压强P A =0.75atm;②由图示图象可知,p C =1.5atm,已知:V B =3L,由B到C过程是等温变化,由玻意耳定律得:p B V B =p C V C ,解得:V C =2L;