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Question:

The rate constant of the reaction A→B is 0.6 × 10⁻³ mole per litre per second. If the concentration of A is 5 M, then the concentration of B after 20 minutes is:

3.60M

0.36M

1.08M

0.72M

Solution:

The rate constant has unit mole per second which indicates zero order reaction.
x = kt
The concentration of B after 20 minutes is
20 × 60 × 0.6 × 10⁻³ = 0.72M