Air is filled at 60deg C in a vessel of open mouth. Upto what temperature should the vessel be heated so that one-fourth of the air may escape?

Ans 171degC

8 answers

PV = n R T
P,V and R are constant
so n T is constant
n1 T1 = n2 T2
n2 = .75 n1

n1 T1 = .75 n1 T2
T2 = T1/.75
T1 = 273 + 60 = 333
so
T2 = 333/.75 = 444
444-273 = 171
thank you soo much :)
thnx
But if we use Charles law such that v1/t1= v2/t2
Then the answer becomes 249.75 K
Ad how the volume is constant.
It is I think volume is changing by 3/4 parts. I'm in dilemma. Can anyone clear my doubt ??
Thats the answer according to S.Chand's also 171K enx for solving
Jagat we cannot use Charles law because the container is open moles at not constant
Can anyone explain it more clearly.......please as soon as possible 😞😞😞
Why can't we use charle's law??