When 3 moles of nitrogen monoxide are formed, how many moles of oxygen reacted? 4 NH3(g) + 5O2 (g) 4 NO (g) + 6 H2O (1)
->

3.75

Explanation:

it's gonna be a decimal number,cus from the formula 5moles produce 4moles of NO

so if 3 moles we're to be produced,it will be 3x5 divide by 4

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying