(Solved): Consider this reaction: 2NH3(g)N2(g)+3H2(g) At a certain temperature it obeys this rate ...

Consider this reaction: $2{\mathrm{NH}}_3(g)?{\mathrm{N}}_2(g)+3{\mathrm{H}}_2(g)$ At a certain temperature it obeys this rate law. $\text{ rate }=\left(3.07{\mathrm{M}}^{?1}?{\mathrm{s}}^{?1}\right){\left[{\mathrm{NH}}_3\right]}^2$ Suppose a vessel contains ${\mathrm{NH}}_3$ at a concentration of $1.27\mathrm{M}$. Calculate the concentration of ${\mathrm{NH}}_3$ in the vessel 0.910 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits.