Question

When a gas is at 1.3 atm and 62°C it has a volume of 7.2 L. When it is cooled to 41°C and expanded to 8.6 L, what is its pressure?


Choices are

78.9 atm

1.02 atm

5.0 atm

22228atm

Answer 1

Answer:

1.02 atm

Explanation:

PV = nRT

for 1st case

=> 1.3 atm * 7.2L = n * 0.0821 atm. L/molK * 335K

=> n = 0.34 mol

We have 0.34 mol of gas.

for 2nd case

=> P * 8.6L = 0.34mol * 0.0821 atm. L/molK * 314K

=> P = 1.02 atm