Answer:
Temperature
Explanation:
If the pressure, volume, and number of moles of a gas are known than temperature is needed to be known to determine the general gas constant.
Formula:
PV = nRT
P = pressure
V = volume
R = general gas constant
T = temperature
n = number of moles
Example:
V = 2 L, P = 1 atm , T = 273 K , n = 0.09 mol
PV = nRT
R = PV/nT
R = 1 atm. 2L / 0.09 mol . 273 K
R = 2 L. atm / 24.57 mol. k
R = 0.082 atm. L / mol.k
