23. A first order reaction has a specific reaction rate of10⁻² s⁻¹. How much time will it take for 20 g of thereactant to reduce to 5 g?
(1) 238.6 second
(2) 138.6 second
(3) 346.5 second
(4) 693.0 second
Answers
Answered by
1
Answer:
Explanation:
We know that for a first order reaction
t=2.303klog.aa−x
Here, initial concentration a=10g and concentration left after time ts=2.5g
i.e., (a−x)=2.5g,
Specific reaction conctant k=10−3s−1
∴ Time required for the reactant to reduce to 2.5g
=2.30310−3×log4=2.30310−3×0.6021 (Given log4=0.6021)
=1386.6s
Similar questions