Question

What mass of nitrogen monoxide can be made by the reaction of 8.00 g ammonia and 17.0 g oxygen?

correct answer is 12.8 ± 0.1 (g)

I keep getting 14.1 g

and that the limiting reagent is NH3

What am I doing wrong?

Answer 1

I suspect you didn't write and balance the equation. I worked it and obtained 12.8g and O2 is the limiting reagent.
Equation is
4NH3 + 5O2 ==> 4NO + 6H2O

Answer 2

yep that was defiantly the problem.

thank you