Question

What is the pressure of 4 moles of helium in a 50 L tank at 308 K?

Answer 1

`P~=2*atm`

Explanation:

We assume ideality, and from the Ideal Gas Equation,

`P=(nRT)/V=(4*molxx0.0821*(L*atm)/(K*mol)xx308*K)/(50*L)`

`~=` `2*atm`.

The difficult part of this equation is to select the appropriate gas constant, with the appropriate units. Fortunately, in any examination, several Gas constants, with a selection of appropriate units, will be supplied.