Question

What are some common mistakes students make with the molar volume of a gas?

Answer 1

`V_m = V/n = (RT)/P`.

Explanation:

Choice of `R`, the gas constant with the appropriate units, is an error I still am prone to make (hopefully not here). The choice of units does not help. Litres would reasonably be the most useful choicefor the practising chemist . The gas constant is `??`.

`R` = `0.0821` `(L*atm)/(mol*K)`.

Of course, the pressure might not be quoted in atmospheres, but in kilopascals, and so, `R` `=` `8.31 *J*mol^(-1) K^(-1)`. It is hard to convert this dimensionally to units of pressure.