the rate constant of the reaction A---->B is 0.610^-3 mole per sec. if the concentration of A is 5 M then concentration of B after 20 min is

Dear Student,

Please find below the solution to the asked query:
If total concentration is = x
Concentration of A = 5M
Concentration of B = (x-5)M
Rate of reaction : 0.6 x 10-3 mole/sec
Thus 0.6 x 10-3 =  x-520×60sec
         ‚Äč 0.6 x 10-3  x 1200 = x-5
   Thus concentration of B ,  = 0.72M

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ans is 0.72M how..
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