For the hypothetical reaction A + 2B → 2C + D,the initial rate of disappearance of A is 2.0 × 10^-2 mol/(L ∙ s).What is the initial rate of disappearance of B?

Question

Quizplus · Accepted Answer

From the stoichiometry of the reaction, we can see that for every 1 mole of A that disappears, 2 moles of B disappear. Therefore, the initial rate of disappearance of B would be half of the initial rate of disappearance of A, multiplied by a factor of 2 (stoichiometric coefficient):
Initial rate of disappearance of B = 0.5(2.0 × 10^-2 mol/(L ∙ s))×2 = 4.0 × 10^-2 mol/(L ∙ s) = 4 × 10^-1 mol/(L ∙ min)

For the Hypothetical Reaction a + 2B → 2C