For a reaction $2\mathrm{X}\left(\mathrm{g}\right)⟶3\mathrm{Y}\left(\mathrm{g}\right)+2\mathrm{Z}\left(\mathrm{g}\right)$ the following data is obtained

Time (min)	${\mathrm{P}}_{\mathrm{x}}$ (mm of Hg) (Partial pressure of X)
$0$	$800$
$100$	$400$
$200$	$200$

Find order (n) with respect to X, rate constant (k) of the reaction, time taken (in min.) for $75\%$ completion $t_{3/4}$ and find the total pressure when partial pressure of X, ${\mathrm{P}}_{\mathrm{x}}$ $=700$ mm of $\mathrm{Hg}$. Report value of $\frac{(P_{Total}\times n\times t_{3/4})}{1000}$