The temp of a gas @ STP's changed to 125 celcius @ constant volume.What's da final pressure in atmospheres?

Question

i really need help on this one

Answer 1

Idea gas law

PV = nRT

P/T = nR/V

Now at T2

P2/T2= nR/V

Sub in first equation as the number of moles, the volume and the idea gas constant are the same.

P1/T1 = P2/T2

rearrange for P2

(P1 x T2) /T1 = P2

Sub in P1 (1 atm), T1 = (298K) T2 (386K)

(1 atm x 386K) / 298 k = 1.29 atms