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$C (s) + {CO}_{2} (g) ⟶ 2 CO (g) ΔH = 172 kJ \cdot {mol}^{- 1}$
In a suitable reaction vessel, pieces of graphite are mixed with carbon dioxide gas at 1.00 atm and 1000 K. Which of the following changes will result in an increase in reaction rate?

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Decrease in temperature

Decrease in partial pressure of CO(g)

Decrease in size of the graphite pieces

Decrease in partial pressure of ${CO}_{2} (g)$

answer is A.

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Detailed Solution

Increase in reaction rate decrease in size of the graphite pieces

A reactant's surface area affects both the number of collisions and the rate of reaction.

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