SELECT * FROM question_mgmt as q WHERE id=1815 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=59 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

 A first order reaction has a rate constant 1.15 10-3s-1. How long will 5 g of this reactant take to reduce to 3 g?

Answer:

From the question, we can write down the following information:

Initial amount = 5 g

Final concentration = 3 g

Rate constant = 1.15 10 - 3s - 1

We know that for a 1st order reaction,

= 444.38 s

= 444 s (approx)


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