The decomposition a → b + c of a molecule a obeys the rate-law expression rate = 0.080 min-1 [a]. if the initial concentration of a is 0.30 m, what is the concentration after 2.6 minutes? 1. 0.028 m 2. 0.24 m 3. 0.38 m 4. 0.13 m 5. 0.32 m 0

Question

Physics

Donavan Bowen

28 February, 05:21

The decomposition a → b + c of a molecule a obeys the rate-law expression rate = 0.080 min-1 [a]. if the initial concentration of a is 0.30 m, what is the concentration after 2.6 minutes? 1. 0.028 m 2. 0.24 m 3. 0.38 m 4. 0.13 m 5. 0.32 m 0

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Bernard Lang · Answer 1

The correct option from given choices is 2, that is 0.24 m

We can find this by using the following formula;

ln A = ln Ao - kt

Ao = 0.30

k = 0.080 min⁻¹

t = 2 ... 6 min

ln A = ln 0.30 - (0.080 min ⁻¹) (2.6 min)

ln A = - 1.412

A = 0.24 m