A gas has an initial volume of 21.7 L at a pressure of 0.4 atm and a temperature of 252 K. The pressure of the gas increases to 2 atm as the temperature increases to 323 K. What is the final volume of the gas?

Use the combined gas law, keeping the amount of gas constant: V₂ = V₁P₁T₂/(P₂T₁). Substituting the values gives V₂ = (21.7 L × 0.4 atm × 323 K)/(2 atm × 252 K) ≈ 5.6 L. Therefore, the final volume is 5.6 L, choice B.

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