Question

What is R in the mathematical expression of the ideal gas law?

Answer 1

The units of Ideal gas law constant is derived from equation PV = nRT?

Where the pressure - P, is in atmospheres (atm) the volume - V, is in liters (L) the moles -n, are in moles (m) and Temperature -T is in Kelvin (K) as in all gas law calculations.

The R value is the Ideal Gas Law Constant which we derive through algebraic reconfiguration we end up with Pressure and Volume being decided by moles and Temperature, giving us a combined unit of
`(atm x L) / (mol x K)`. the constant value then becomes 0.0821 `(atm(L))/(mol(K))`

If you choose not to have your students work in standard pressure unit factor, you may also use: 8.31 `(kPa(L))/(mol(K))` or 62.4 `(Torr(L))/(mol(K))`.

Temperature must always be in Kelvin (K) to avoid using 0 C and getting no solution when students divide.

There is a variation of the ideal gas law that uses the density of the gas with the equation PM = dRT

Where M is the Molar Mass in `g/mol` and d is the Density of the gas in `g/L`.

Pressure and Temperature must remain in the units atm and K and the Gas Law Constant remains R = 0.0821 `((atm) L) / ((mol) K)`.

I hope this is helpful.
SMARTERTEACHER