# kinetic theory

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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

• kinetic theory -

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

• kinetic theory -

thank you soo much :)

• kinetic theory -

thnx

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