alleryStart learning →Changing the volume of a gas-phase equilibrium changes the concentrations of:
AOnly the products
BNeither of the two
CReactants and products
DOnly the reactants
Answer & Solution
Correct answer: C. Reactants and products
1. The pressures of species in a gas-phase equilibrium can be changed by changing the volume the system occupies.
2. All species of a gas-phase equilibrium occupy the same volume.
3. So a given change in volume will cause the same change in concentration for both reactants and products.
4. Whether that shifts the equilibrium then depends on the mole counts on the two sides.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 13 'Fundamental Equilibrium Concepts', sections 13.1-13.4_
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