AP Chemistry Warm-up #2

Gaseous ammonia is synthesized from nitrogen and hydrogen.

1) Write a balanced chemical reaction:
             N₂ + 3H₂ ----> 2NH₃

2) If you take 355 L of hydrogen gas at 25.0 Celsius and 542 mm Hg and
    combine it with excess nitrogen gas, what is the theoretical yield of
    ammonia?
              542 mm Hg x (1atm / 760. mm Hg) = 0.7132 atm (keep an extra sig. fig.)

              n = PV / RT

              n = ( 0.7132 atm x 355 L) / ( 0.08206 Latm/Kmole x 298.2 K)

              n = 10.35 moles H₂(keep an extra sig. fig.)

              10.35 moles H₂ x (2 moles NH₃ / 3 moles H₂) = 6.900 moles NH₃

              6.900 moles NH₃ x (17.03 g NH₃ / 1 mole NH₃) = 118 g NH₃

3) If the ammonia occupies a 125 L tank at 25.0 Celsius, what is its
     pressure?