The combined gas law is used to determine the relationship between the pressure, temperature, and volume of the gas. The volume of the gas at 0.250 atm is 236 L. Thus, option A is correct.
The combined gas law uses the ideal gas equation to estimate the temperature, volume, or pressure of the given gas.
Given,
Initial pressure = 0.500 atm
Initial temperature = 288.15 K
Initial volume = 120 L
Final pressure = 0.250 atm
Final temperature = 283.15 K
The final volume is calculated as:
V₂ = (P₁V₁ T₂) ÷ (P₂ T₁)
= 0.500 × 120 × 283.15 ÷ 0.250 × 288.15
= 16989 ÷ 72.03
= 235.86 L
Therefore, 236 L is the final volume at 0.250 atm.
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