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Give an example of a zero order reaction...

Give an example of a zero order reaction and write an expression for its rate constant.

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`H_(2)+Cl_(2)overset("hv")to2" HCl or "2" NH"_(3)overset("Pt")to"N"_(2)+3" H"_(2)`. Rate constant, `k=(1)/(t){[A]_(0)-[A]}`.
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