Find total volume of gases produced lol under reaction

Question

What is the total volume of gases produced at 819 K and 1.00 atm pressure when 256 g of ammonium nitrite undergoes the following decomposition reaction?

NH4NO2(s) → N2(g) 2H2O(g)

A. 22.4 L

B. 4 × 22.4 L

C. 3 × 22.4 L

D. 12 × 22.4 L

E. 36 × 22.4 L

Answer 1

u have 4 mol of NH4NO2

from rqn u obtain 4*3 mol of gas