Question

​ an open flask contains air at 27degree celsius .calculate the temperature at which it should be heated so that 1/3rd of air measured at 27 degree celsius escapes out

Answer 1

27°C= 27+273= 300 Kelvin
Let at temperature1 (T1), volume = 1 litre
When ⅓ air escapes out, air left = ⅔ litre
use V1T1= V2T2
1 x 300 = ⅔ x T2
T2= 450 Kelvin
ie 450-273= 177°C

Answer 2

Answer:

177 degree C

Explanation:

Let T1=27 degree C= 27+273 = 300K

and T2=?

Let initial number of moles of air at 27 degree C=n

At temperature T2 K, the no. of moles left =n−n/3=2n/3  

At constant pressure and volume, n1T1=n2T2

⇒n×300=(2n/3) T2

⇒T=450 K = 450-273 = 177 degree C.