A gas at 1 atm, 2 dm³ and 400 K changes to 4 atm and 300 K. What is the new volume?
Answer and explanation
Correct answer: C. 0.375 dm³
- Step 1: Combined gas law: P₁V₁/T₁ = P₂V₂/T₂. Step 2. V₂ = P₁V₁T₂ ÷ (T₁P₂) = 0.375 dm³. Answer: 0.375 dm³. Why not the others: 6 dm³ is what you get if you invert the pressure ratio. 0.667 dm³ is what you get if you invert the temperature ratio. 2 dm³ is what you get if you ignore both changes.
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