Based on the rate of disappearance of HI, the rate of appearance of I₂ is 0.225 mol/L/s.
The rate of a reaction is the rate at which reactant molecules are converted to product or the rate at which product molecules are formed.
From the equation of the reaction, 2 moles of HI produces 1 mole of I₂.
The rate of disappearance of HI is -0.45 mol/L/s
The rate of appearance of I₂ will be 0.45/2 mol/L/s = 0.225 mol/L/s.
Therefore, the rate of appearance of I₂ is 0.225 mol/L/s.
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