The reactant concentration in a zero-order reaction was 5.00×10−2 M after 195 s and 2.50×10−2 M after 385 s . What is the rate constant for this reaction? Express your answer with the appropriate units. Indicate the multiplication of units, as necessary, explicitly either with a multiplication dot or a dash.

Answer : The rate constant for this reaction is,

Explanation :

To calculate the rate constant for zero order reaction, the expression used is:

where,

= initial concentration

= final concentration = at 195 s

= final concentration = at 385 s

k = rate constant = ?

Now put all the given values in the above expression, we get:

      ............(1)

and,

       ............(2)

Subtracting 1 from 2, we get:

Therefore, the rate constant for this reaction is,

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