What mass of lithium (in g) is required to react completely with 58.3 mL of N2 gas at STP?

Answer 1

2Li + 3N2 ==> 2Li3N
mol N2 gas at STP = 58.3/22,400 = ? since 1 mol of a gas at STP occupies 22.4 L.
Convert mols N2 to mols Li using the coefficients in the balanced equation.
Then convert mols Li to g Li. g = mols x atomic mass.