With different number of moles of reactants and product, what happens to the volume of the system?
Correct answer: B. It changes
- A. It remains unchanged
- B. It changes
- C. It decreases
- D. It increases
Explanation
According to the ideal gas law, PV = nRT, the volume of a gas is directly proportional to the number of moles of gas present (n), assuming constant pressure (P), temperature (T), and gas constant (R). Therefore, if the number of moles of reactant and product in a chemical reaction are different, the volume of the system will generally change. Hence, option B is correct.
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About Le Chatelier's Principle
Le Chatelier's principle predicts how an equilibrium responds when concentration, pressure or temperature changes. Questions apply it to reversible reactions, identify the direction of shift and distinguish genuine equilibrium changes from the effect of a catalyst, which changes the rate of reaching equilibrium but not its position.
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