For a certain gas-phase reaction, the fraction of products in an equilibrium mix

Question

For a certain gas-phase reaction, the fraction of products in an equilibrium mixture is increased by either increasing the temperature or by increasing the volume of the reaction vessel.

Part A

Is the reaction exothermic or endothermic?

A. The reaction must be endothermic if heating increases the fraction of products.
B. The reaction must be endothermic if heating decreases the fraction of products.
C.The reaction must be exothermic if heating increases the fraction of products.


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Part B

Does the balanced chemical equation have more molecules on the reactant side or product side?

A. There must be more moles of gas in the products if increasing the volume of the vessel increases the fraction of products.

B. There must be more moles of gas in the products if increasing the volume of the vessel decreases the fraction of products.



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Explanation / Answer

A. The reaction must be endothermic if heating increases the fraction of products. A. There must be more moles of gas in the products if increasing the volume of the vessel increases the fraction of products.

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