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Question
If the initial concentration of substance A is 1.5 M and after 120 seconds the concentration of substance A is 0.75 M, the rate constant for the reaction if it follows zero-order kinetics is ______.
Options
0.00625 molL-1s-1
0.00625 s-1
0.00578 molL-1s-1
0.00578 s-1
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Solution
If the initial concentration of substance A is 1.5 M and after 120 seconds the concentration of substance A is 0.75 M, the rate constant for the reaction if it follows zero-order kinetics is 0.00625 molL-1s-1.
Explanation:
For Zero order reaction,
k = `(["R"]_0 - ["R"])/"t"`
k = `(1.5 - 0.75)/120`
k = 0.00625 molL-1s-1
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