Consider this reaction: 2NH3(g) → N2(g) + 3H2(g).
At a certain temperature it obeys this rate law. rate = (0.0651 s^-1)[NH3]
Suppose a vessel containing NH3 at a concentration of 1.00M. Calculate the concentration of NH3 in the vessel 9.80 seconds later. You may assume no other reaction is important. Round your answer to 2 significant figures.