I need help with this chemistry problem please, I got the others but this one is difficult...

Question

A 1 mole sample of helium gas occupies 12.4L at 300K and 0.956atm. What volume will the 1 mole sample of helium occupy at 40oC and 1.20atm?

Answer 1

This is a gas problem with two different conditions. Condition 1 and Condition 2. We can relate these conditions if we rearrange PV = nRT. Since R is a constant, PV/nT = R. Thus

P1V1/n1T1 = P2V2/n2T2

n doesn't change so,

P1V1/T1 = P2V2/T2

where 1 and 2 denote the two different conditions. Then just plug in the numbers:

(12.4)(0.956)/(300) = (1.20)*(V)/(40+273)

40 + 273 is the Celcius to Kelvin conversion.