Question 4

Maam please do this Question

In the B part
let us say amount of gas initially is  X
left amount is Y and 2/3 Y has come out.This will help us in calculating Y in X
y = 3/5 X
Now to keep Pressure constant as 1 atm and volume as V

n1T1 = n2T2
n1= x
T1 = 300
n2 = 3/5 x
T2 = ??
now you can solve it.