Question

A 82.7 g sample of dinitrogen monoxide is confined in a 2.0 L vessel, what is the pressure (in atm) at 115°C?

Answer 1

`P = (nRT)/V`; we assume (reasonably?) ideal gas behaviour for `N_2O`.

Explanation:

The only challenge to this problem is selecting the appropriate gas constant; here, we choose `R = 0.0821*L*atm*K^(-1)*mol^(-1)`. This gas constant (and others) would be supplied. Of course, we've got to choose the right one for the job!

So, `P = ((82.7*g)/(44.01*g*mol^-1)xx0.0821*L*atm*K^(-1)*mol^-1xx388K)/(2.0*L) = ?? atm`

You will note that we have converted the temperature to absolute.