From the given information, it can be easily deduced that in the final mixture,partial pressure of A=1.0 atmpartial pressure of B=0.5 atmAlsonA​nB​nA​nB​​MA​:MB​​=RTpA​V​=RTV​=RTpB​V​=RT0.5V​=21​=MB​wB​​×wA​MA​​=23​×(MB​MA​​)=1:3​