alleryStart learning →Hydrogen peroxide decomposes as 2H2O2 giving 2H2O plus O2. If H2O2 disappears at 3.20 x 10^-2 mol/L/h, at what rate is O2 produced?
A1.60 x 10^-2 mol/L/h
B3.20 x 10^-2 mol/L/h
C6.40 x 10^-2 mol/L/h
D0.80 x 10^-2 mol/L/h
Answer & Solution
Correct answer: A. 1.60 x 10^-2 mol/L/h
1. The coefficients give 2 mol of H2O2 consumed for every 1 mol of O2 formed.
2. So the rate of O2 formation is half the rate of H2O2 loss.
3. Half of 3.20 x 10^-2 mol/L/h is 1.60 x 10^-2 mol/L/h.
4. Choosing 3.20 x 10^-2 mol/L/h ignores the coefficients altogether.
5. Choosing 6.40 x 10^-2 mol/L/h multiplies by 2 instead of dividing by 2.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 12 "Kinetics", section 12.1 Chemical Reaction Rates_
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