Final answer:
The new pressure of the neon gas when cooled from 50°C to 25°C would be approximately 2.31 mm Hg, calculated using the combined gas law, assuming no changes in volume or the amount of gas. An exact answer choice does not match, suggesting there may be an error in the question or choices.
Step-by-step explanation:
To find the new pressure of a sample of neon gas that is cooled from 50°C to 25°C, we can use the combined gas law which states that P1/T1 = P2/T2 where P represents the pressure and T represents the temperature in Kelvin. To solve for the new pressure (P2), rearrange the equation to P2 = P1 * (T2/T1). Converting the temperatures to Kelvin gives us T1 = 50°C + 273.15 = 323.15 K and T2 = 25°C + 273.15 = 298.15 K. Plugging in the values we have P2 = 2.50 mm Hg * (298.15 K / 323.15 K). Calculating this gives us a new pressure of approximately 2.31 mm Hg. However, since this option is not available in the provided choices, we should review our calculations or consider that a rounding or transcription error might have occurred in the question or answer choices.