Problem: Phosgene is formed by the reaction of Cl 2 and CO. The experimental rate law is  Rate = k [CO][Cl2]3/2. The proposed reaction mechanism is  Cl2(g) ⇌ 2Cl(g)                                       Step 1 Cl(g) + CO(g) ⇌ ClCO(g)                       Step 2 ClCO(g) + Cl2(g) → Cl2CO(g) + Cl(g)     Step 3 For the proposed reaction mechanism to be consistent with the rate law: a) Step 1 is slow and Steps 2 and 3 are fast b) Step 3 is fast and steps 1 and 2 are slow c) Steps 1 and 2 are fast and step 3 is slow d) Steps 1 and 3 are fast and step 2 is slow e) Step 1 is fast and steps 2 and 3 are slow

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Problem Details

Phosgene is formed by the reaction of Cl 2 and CO. The experimental rate law is 

Rate = k [CO][Cl2]3/2.

The proposed reaction mechanism is 

Cl2(g) ⇌ 2Cl(g)                                       Step 1

Cl(g) + CO(g) ⇌ ClCO(g)                       Step 2

ClCO(g) + Cl2(g) → Cl2CO(g) + Cl(g)     Step 3

For the proposed reaction mechanism to be consistent with the rate law:

a) Step 1 is slow and Steps 2 and 3 are fast

b) Step 3 is fast and steps 1 and 2 are slow

c) Steps 1 and 2 are fast and step 3 is slow

d) Steps 1 and 3 are fast and step 2 is slow

e) Step 1 is fast and steps 2 and 3 are slow

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