The rate constant for a first order reaction is `7.5 xx 10^(-4) s^(-1)`. If initial concentration of reactant is `0.080 M`, what is the half life of r

Question

The rate constant for a first order reaction is `7.5 xx 10^(-4) s^(-1)`. If initial concentration of reactant is `0.080 M`, what is the half life of r

The rate constant for a first order reaction is `7.5 xx 10^(-4) s^(-1)`. If initial concentration of reactant is `0.080 M`, what is the half life of reaction ?
A. `990 s`
B. `79.2s`
C. `12375 s`
D. `10.10 xx 10^(-4) s`

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - A
Given , `K = 7 xx 0^(-4)s^(-1),[A]_(0) = 0.08 M`
Half life `(t_(1//2))` of a first order reaction is independent of initial concentration and is given as
`t_(1//2) = (0.693)/(k) = (0.693)/(7xx 10^(-4)s) = 990 s`

5 views Answered 2023-02-05 15:29