Answer:
0.10 moles H₂O
Step-by-step explanation:
The unbalanced equation:
NH₃ (g) + O₂ (g) ----> NO (g) + H₂O (g)
Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen
Products: 1 nitrogen, 2 hydrogen, 2 oxygen
The balanced equation:
4 NH₃ (g) + 5 O₂ (g) ----> 4 NO (g) + 6 H₂O (g)
Reactants: 4 nitrogen, 12 hydrogen, 10 oxygen
Products: 4 nitrogen, 12 hydrogen, 10 oxygen
Now that the reaction is balanced, you can use the coefficients of the desired molecules to construct the mole-to-mole ratio. This ratio should be multiplied by the given value (0.085 moles). It is important to arrange the ratio in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 2 sig figs to match the given value.
0.085 moles O₂ 6 moles H₂O
------------------------- x ------------------------ = 0.10 moles H₂O
5 moles O₂