4nh3(g)+5o2(g)⟶4no(g)+6h2o(g) how many molecules of h2o can be formed from 6.12mol nh3?

The answer to your question is 5.529 x 10²⁴ molecules of H₂O

Explanation:

                     4NH₃  + 5O₂   ⇒   4NO   +   6H₂O

                      6.12 mol                               ? molecules

Rule of three (proportions)

                     4 mol of NH₃   6 mol of H₂O

                     6.12 mol of NH₃    x mol of H₂O

                     x = (6.12 x 6) / 4

                     x = 36.72 / 4

                     x = 9.18 mol of H₂O

                     1 mol of H₂O 6.023 x 10²³ molecules

                     9.18 mol of H₂O   x

                     x = (9.18 x 6.023 x 10²³) / 1

                     x = 5.529 x 10²⁴ molecules