The decomposition of 65.9 g ammonium nitrate yields how many liters of dinitrogen monoxide at 2.65 atm and 303 k?

(N= 14.01 g/mol, H= 1.008 g/mol, O=16.00 g/mol)
NH4NO3(s) -> N2O(g)+2H2O(g)

Hint: R = 0.0821 L atm/(mol K)