A sample of nitrogen gas collected at a pressure of 1.16 atm and a temperature of 29.0 °C is found to occupy a volume of 20.9 liters. How many moles of N2 gas are in the sample?____ mol

I remember telling you yesterday that two gas law formulas would work 99% of your problems. One is

(P1V1/T1) = (P2V2/T2) which doesn't involve moles.
When moles are involved you want to use
PV = nRT