15 miles of gas are in a 7.00 L tank at 21.0 degrees C. Calculate the difference in pressure between methane and an ideal gas under these conditions.

Question

The van der waals constants for methane are a= 2.300 L^2 and b= 0.0430 L/mol.

Answer 1

Hello Hailey, I'm going to assume you meant 15 moles.

 

For an ideal gas, we use PV = nRT

For a real gas such as methane, we use:

 

[P+a(n/V)²][(V/n) - b] = RT 

 

Plug in all the values:

n = 15,

R = 0.082056

T = 21 + 273

V = 7 

 

Your Pressure, P should be in units of atm. 

After you calculate P for each equation, find the difference between them.