Elementary and Complex Reactions

Q. 26.calculate the equilibrium constant for the reaction given below at 400k . If Δ H^° =77.2kJmol and Δ S^° =122Jkmol PCl5 gives PCl3 + Cl2

Q.

For the reaction

N₂ (g) + 3H₂ (g) ------2 NH₃ (g), K_p = 51

Find the value of K_p for the reaction

2 NH₃ (g) ------ N₂(g) + 3H₂ (g)

Q. For the reaction $2\mathrm{NO}+{\mathrm{Br}}_2\to 2\mathrm{NOBr}$the following mechanism has been given:
$\mathrm{NO}+{\mathrm{Br}}_2\rightleftharpoons {\mathrm{NOBr}}_2$
${\mathrm{NOBr}}_2+\mathrm{NO}\to 2\mathrm{NOBr}\left(\mathrm{slow}\right)$
Hence, the rate law is :

1. $k\left[NO{]}^2\right[B{r}_2]$
2. $k\left[NO\right]\left[B{r}_2\right]$
3. $k\left[NOB{r}_2\right]\left[NO\right]$
4. $k\left[NO\right][B{r}_2{]}^2$

Q. The decomposition of ozone proceeds as $O_3\iff O_2+O\left(fast\right)O+O_3\to 2O_2\left(slow\right)$
The rate expression should be

1. $r=k[O_3{]}^2$
2. $r=k\left[O_3{]}^2\right[O_2{]}^{-1}$
3. $r=k\left[O_3\right]\left[O_2\right]$
4. $r=k\left[O_3\right][O_2{]}^{-1}$

Q. Which of the following colloids is a positively charged colloid?

Q. the value of the kc for the reaction 2hi gives h2 +i2 is 1*10^-4. at a given time the composition of reaction mixture is [hi] = 2*10^-5 mol , h2 = 1*10^-5mol i2 = 1*10^-5mol in which direction the reaction will proceed??