For the reaction 2HI → H2 + I2, the expression $- \frac{1}{2}\frac{d\lbrack HI\rbrack}{dt}$ represents

Chemical Kinetics and Nuclear ChemistryMedium

Question

For the reaction 2HI → H₂ + I₂, the expression $- \frac{1}{2}\frac{d\lbrack HI\rbrack}{dt}$ represents

A.the rate of formation of HI.

B.the rate of disappearance of HI.

C.the instantaneous rate of the reaction.

D.the average rate of the reaction.

$r_{\text{inst}} = - \frac{1}{2}.\frac{d\lbrack HI\rbrack}{dt}$

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