A gas has a pressure of 0.450 atm at 50.0 °C. What is the pressure at 0°C?

Answer 1

Use Gay-Lusaac's Law to solve, which states that pressure and temperature are directly proportional. Since the temperature is decreasing from 50 to 0 °C, the pressure will also decrease.

P1/T1 = P2/T2

P1 = 0.450 atm

T1 = 50 °C (need to convert to Kelvin) = 50 + 273 = 323 K

P2 = ?

T2 = 0 °C (need to convert to Kelvin) = 0 + 273 = 273 K

Rearrange the equation to solve for P2

P2 = P1T2 / T1 = (0.450 atm x 273 K) / 323 K = 0.380 atm