Page No 111: - Chapter 4 - Chemical Kinetics - Intext Solutions - Ncert Solutions class 12 - Chemistry
Updated On 26-08-2025 By Lithanya
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Question 4.5:
A first order reaction has a rate constant 1.15 10−3 s−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 10−3 s−1
We know that for a 1st order reaction,
_13-11-08_Utpal_12_Chemistry_4_9_html_m634877af.gif)
= 444.38 s
= 444 s (approx)
Question 4.6:
Time required to decompose SO2Cl2 to half of its initial amount is 60 minutes. If the decomposition is a first order reaction, calculate the rate constant of the reaction.
Answer:
We know that for a 1st order reaction,
_13-11-08_Utpal_12_Chemistry_4_9_html_470b8c21.gif)
It is given that t1/2 = 60 min
_13-11-08_Utpal_12_Chemistry_4_9_html_m2301ba1b.gif)
