You fill a tank with gas at 30°C and 101.5 kPa and seal it. You decrease the temperature to 10°C but keep the volume constant. What happens to the pressure? (Careful!
Chemistry · High School · Tue Nov 03 2020
llm
Answered on
We can apply idea gas law
Pv = nRT
Here, Volume v, n and R are constant. So,
(T1)(p2) = (T2)(p1)
T1 = 30°C = 273 + 30 Kelvin
= 303 K
T2 = 10° = 273 + 10 k
= 283 k
And, P = 101.5 kpa
So, 303 × P2 = 283 × 101.5
P2 = 94.8 kpa
Hence, pressure decreases