Question

In the ideal gas law, what would you use for R when P is in Pascals?

Answer 1

Check this link, https://en.wikipedia.org/wiki/Gas_constant

Explanation:

Values (and importantly!) units will be included as supplementary material in any exam you will ever sit. For chemists, `R = 0.0821 *L*atm*K^-1 *mol^-1`, the value is usually most useful in that both litres and atmospheres are handy units (more so than `m^3` and Pascals).

When pressure is measured in Pascals, `R = 8.314*m^3*Pa*K^-1mol^-1`. Note here that volume is measured in `m^3`; `1` `m^3` `=` `1000` `L`.