Question

The rate of the reaction,

\[\ce{CCl3CHO + NO -> CHCl3 + NO + CO}\]

is given by the equation, rate = k [CCl₃CHO)[NO]. If concentration is expressed in mol/litre, the units of k are ______.

Options

• mol⁻² L² s⁻¹

• mol L⁻¹ s⁻¹

• mol⁻¹ L s⁻¹

• s⁻¹

Answer 1

The rate of the reaction,

\[\ce{CCl3CHO + NO -> CHCl3 + NO + CO}\]

is given by the equation, rate = k [CCl₃CHO)[NO]. If concentration is expressed in mol/litre, the units of k are mol⁻¹ L s⁻¹.

Explanation:

The given reaction is 

\[\ce{CCl3CHO + NO -> CHCl3 + NO + CO}\]

Rate law: rate = k [CCl₃CHO)[NO]

This implies the reaction is first order in each reactant and second order overall.

Rate has units mol L⁻¹ s⁻¹

Each concentration is mol L⁻¹

From rate = k [CCl₃CHO)[NO]

⇒ k = `"Rate"/(["CCl"_3"CHO"]["NO"])`

⇒ Units of k = `(mol L^-1 s^1)/((mol L^-1)^2)`

= mol⁻¹ L s⁻¹