How many moles of nitrogen monoxide will be generated when 0.83 moles of nitrogen dioxide gas reacts with water? 3no2 + h2o 2hno3 + no
0.277 moles
0.415 moles
0.830 moles
1.000 moles
1.660 moles

A chemical equation lets us observe the ideal molar ratio between two chemical species that are taking part in a chemical reaction. This ratio is equivalent to the ratio of the stoichometric coefficients of the species. Therefore, the ratio between nitrogen dioxide and nitrogen monoxide is:
3 : 1

If 0.83 moles of nitrogen dioxide are present, the moles of nitrogen monoxide will be:
0.83/3
Moles of nitrogen monoxide are 0.277.