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Rate of Reaction

In a reaction...

Question

In a reaction, the concentration of a reactant (A) changes from $0.200 m o l L^{- 1}$ to $0.150 m o l L^{- 1}$ in 10 minutes. What is the average rate of reaction during this interval ?

0.005 mol L^{- 1} {min}^{- 1}

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0.05 mol L^{- 1} {min}^{- 1}

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0.01 mol L^{- 1} {min}^{- 1}

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0.5 mol L^{- 1} {min}^{- 1}

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Solution

The correct option is A $0.005 mol L^{- 1} {min}^{- 1}$
$Δ A = [A]_{f i n a l} - [A]_{i n i t i a l}$
$Δ A = [0.150 - 0.200] = - 0.050 mol L^{- 1}$
$Δ t = 10$ min

$Average rate of reaction = \frac{- Δ A}{Δ t} = \frac{- [- 0.050]}{10}$

$Average rate of reaction = \frac{0.050}{10} = 0.005 mol L^{- 1} {min}^{- 1}$

Thus option (a) is correct.

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