the rate of appearance of hydrohen is equal to ____ times the rate of dissapprrance of HI the ans - Chemistry - Chemical Kinetics

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the rate of appearance of hydrohen is equal to ____ times the rate
of dissapprrance of HI? the ans given is half but how did they get
the ans?

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the rate of appearance of hydrohen is equal to ____ times the rate of dissapprrance of HI? the ans given is half.but how did they get the ans?