10 dm³ of a gas at 400 K is brought to 300 K at constant pressure. What is the new volume?
Answer and explanation
Correct answer: C. 7.5 dm³
- Step 1: Charles's law: V₁/T₁ = V₂/T₂ (T in kelvin). Step 2. V₂ = 10 × 300 ÷ 400 = 7.5 dm³. Answer: 7.5 dm³. Why not the others: 13.333 dm³ is what you get if you invert the temperature ratio. 2.5 dm³ is what you get if you give only the size of the change in volume. 10 dm³ is what you get if you assume the volume stays constant.
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