RATE CONSTANT(k)

The following reaction was monitored as a function of time:
AB—->A+B
A plot of 1/[AB] versus time yields a straight line with slope 5.1×10-2 .

A) WHAT IS THE VALUE OF THE RATE CONSTANT(k) FOR THIS REACTION AT THIS TEMPERATURE?
EXPRESS ANSWERE USING TWO SIGNIFICANT FIGURES.
k=?

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