1. gas vol.225 ml P= 720 torr T=20 deg.celcius.new P if the vol is increased to 350 ml @ cnstant Temp(K)?

Question

2. sample of gas at 25 deg. celcius has pressure of 1.2 atm. Calc. the final pressure if the temp. is changed to 100 deg. celcius at constant vol.

Answer 1

1. you have pV=nRT so at constant temperature pV=constant
and p1V1=p2V2
p2= p1V1/V2
p2= 720*225/350=462.9 torrs

2. same formula pV=nRT p =nRT/V
if V= cte p =kT (k=nR/V)

so p2/p1 = T2/T1
T1= 25+273=298K T2 =273+100=373 K

p2/1.2 = 373/298

p2 = (373/298)*1.2 =1.5 atm