Question

HELP ME <3

If 5.8 moles of nitrogen monoxide (NO) react with 10.0 moles of oxygen gas (O2), how many moles of the product can be formed and how many moles of the excess reactant will be left over when the reaction is complete? Show all of your work.

unbalanced equation: NO + O2 --> NO2

Answer 1

1. balance the equation:
2 NO + O2 --> 2 NO2
now, if 5.8 mol of NO is used, it would consume 2.9 mol of O2. So there is 7.1 mol O2 left over.

Answer 2

But what I don't understand how to do that. How did you get 7.1? @BTaylor

Answer 3

You have 10 mol O2 at the start. You use 2.9. So you have 10-2.9 = 7.1 mol left over.

Answer 4

No way. Was it that simple? -___-

Answer 5

@BTaylor

Answer 6

yup.

Answer 7

But where did the 2.9 come from? @BTaylor

Answer 8

for every mol of NO used, you use half a mole of O2. So multiply 5.8 by 0.5, and you get 2.9

Answer 9

oh okay thank you (: