Question

1.CO reacts with Cl2 to form phosgene (COCl2), a nerve gas used during World War I. (12 points)

〖Cl〗_(2(g))↔2〖Cl〗_((g)) fast

〖CO〗_((g))+〖Cl〗_((g))→〖COCl〗_((g)) slow

〖COCl〗_((g))+〖Cl〗_((g))→〖COCl〗_(2(g)) fast

(a) Determine the overall reation.

(b) Write the rate law expression for each elementary reaction.

(c) Identify any intermediates.

(d) Determine the overall rate law expression.

2.For each of the following elementary reactions, write the rate equation and molecularity:

2NO+H_2→N_2+H_2 O

P〖Cl〗_3+〖Cl〗_2→〖PCl〗_5

Answer 1

1. $CO(g) + Cl_2 (g)\rightarrow COCl_2(g)$

$rate_1 =k_1[Cl_2]$

$rate_2=k_2[CO][Cl]$

$rate_3=k_3[[COCl][Cl]$

Cl- atom of chlor

COCl - Oxalyl chloride

$rare_{overall}=k[CO][Cl_2]$

2. $rate_1=k_1[NO]^2[H_2]$

molecularity₁=3

$rate_2=k_2[PCl_3][Cl_2]$

molecularity₂=2