Rate constant K = 9.5 * 10-² M/s
Given Reaction is first order Reaction can be said by unit of rate constant.
Let initial concentration of [B°] = 100
Residual concentration [B] = 100 - 28.5 = 71.5
For first order reaction-
K = (1/T) ( ln [B°]/[B] )
T = (1/K) ( ln [B°]/[B] )
T = (1/9.5*10-²) ( ln 100/71.5)
T = 10.53 * 0.336
T= 3.537 min
T = 3.537*60 = 212.21 seconds
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