Gaseous ammonia chemically reacts with oxygen (O2)gas to produce nitrogen monoxide gas and water vapor. Calculate the moles of ammonia needed to produce 0.090 mol of water.
Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.

0.072 moles of water () produced by the reaction of 0.060mol of oxygen.
Explanation : Moles of oxygen() given = 0.060 mole
Moles of water () we need to calculate.
Step 1 : Write the balanced chemical equation.

According to balanced equation 5 mole of reacts with 4 mole of to give 4 moles of NO and 6 moles of .
Step 2 : Calculate moles of water () using moles of using mole ratio.
A mole ratio is ​the ratio between the amounts in moles of any two compounds involved in a chemical reaction. The mole ratio is determined by examining the coefficients in front of formulas in a balanced chemical equation.
The coefficient of is 6 and coefficient of is 5, So mole ratio of to is 6 : 5
Moles of =

0.072 moles of is produced by the reaction of 0.060 mole oxygen ()