At a certain elevated temperature, ammonia decomposes on the surface of tungsten metal as...

At a certain elevated temperature, ammonia decomposes on the surface of tungsten metal as follows:

The kinetic data are expressed as the variation of the half-life with the initial pressure of NH3:

(a) Determine the order of the reaction, (b) How does the order depend on the initial pressure? (c) How does the mechanism of the reaction vary with pressure? (Hint: You need to use the equation in Problem 14.129 and plot log t1/2 versus log P.)