A gas is cooled from 365 K to 285 K while its volume changes from 12.8 L to 9.9 L. The initial pressure of the gas is 1.9 atm.

Use the combined gas law: P₁V₁/T₁ = P₂V₂/T₂. Solving for the final pressure gives P₂ = (1.9 atm × 12.8 L × 285 K) ÷ (365 K × 9.9 L) ≈ 1.92 atm. Rounded to the given choices, the final pressure is 1.9 atm, choice C.

AI-written and checked against the verified answer.