Chemistry helpppp

Question

Given the reaction, 4 NH3 + 3 O2 —> 2 N2 + 6 H2O , if 12.0 moles of NH3 are used, then how many moles of water are made.

Answer 1

12 moles of NH3 divided by 4 moles of NH3 per reaction equals 3 moles of reaction. 3 moles of reaction times 6 moles H20 per reaction equals 18 moles of H2O.