The instantaneous rate of appearance of water from the reaction

4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g)

at some moment in time is 21.3 mmHg per minute. What is the instantaneous rate of disappearance of NH3 at the same moment in time?

10.7 mmHg/min

14.2 mmHg/min

21.3 mmHg/min

32.0 mmHg/min

none of these

3 answers

its not 21.3 nor 10.7

6/4 = 21.3/x
solve for x.

14.2 mmHg/min