thermodynamics gas laws

Question

1dm^3 of air at 20oC is heated at a constant pressure of 300 kPA until the volume is doubled calculate:

-final temperature

-the mass

Answer 1

Constant pressure gas law = Charles Law

V1/T1 = V2/T2

(1 dm3)/293K = (2dm3)/T2

T2 = 586K - 273 = 313ºC

To determine mass of air, one needs to know more information. If you take 1.20 g/ml as the density of air at 20ºC. then ...

1.20 g/ml x 1000 ml/dm3 x 1 dm3 = 1200 g = mass of air initially present