SELECT * FROM question_mgmt as q WHERE id=1832 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='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Calculate the half-life of a first order reaction from their rate constants given below:

(i) 200 s-1

(ii) 2 min-1

(iii) 4 years-1

Answer:

(i) Half life, t½ = 0.693 / k

= 0.693 / 200 s-1

= 3.47 ×10 -3 s (approximately)

 

(ii) Half life, t½ = 0.693 / k

= 0.693 / 2 min-1

= 0.35 min (approximately)

 

(iii) Half life,t½ = 0.693 / k

= 0.693 / 4 years-1

= 0.173 years (approximately)


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