What is the volume of 3.70 mol of N2 gas at STP?

So when it says at STP, you are given the values of temperature and pressure.

T=273.15K

P=100kpa

R=8.314 (it's a constant)

n=3.70

V=?

Now use the formula PV=nRT and isolate for V

V=nRT/P

V = (3.70) (8.314) (273.15) / 100

V=84.0L