For the reaction 2NO + O2 ⇌ 2NO2, the rate equation for the forward reaction is:
Correct answer: B. Rate = k [NO]2[O2]
- A. Rate = k [NO] [O2]
- B. Rate = k [NO]2[O2]
- C. Rate = k [NO2]2
- D. Rate = k [NO2]
Explanation
The rate equation involves reactants, not products. Assuming the coefficients in the reaction equation represent the orders of reaction with respect to that reactant the correct rate equation will be B.
This question appeared on the UHS MDCAT 2014 paper, which you can sit online with every answer explained.
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About Rate of Reaction
Reaction rate measures the change in concentration of a reactant or product per unit time. Questions connect rate with concentration, temperature, pressure, surface area, catalysts and nature of reactants, and may involve rate laws, reaction order, activation energy and collision theory. Rate describes speed, whereas equilibrium describes the final balance of opposing reactions.
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