A gas in a rigid container is at 200 kPa and 400 K. It is heated to 800 K. What is the new pressure?
Answer and explanation
Correct answer: B. 400 kPa
- Step 1: At constant volume P₁/T₁ = P₂/T₂. Step 2. P₂ = 200 × 800 ÷ 400 = 400 kPa. Answer: 400 kPa. Why not the others: 100 kPa is what you get if you invert the temperature ratio. 600 kPa is what you get if you add the temperature rise. 200 kPa is what you get if you assume the pressure stays constant.
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