There are 600 molecules of gas in an airtight container, and the volume is held constant. Which changes would cause the greatest DECREASE in pressure? a releasing 200 molecules and increasing the temperature by 20 K b adding 200 more molecules and decreasing the temperature by 20 K c releasing 200 molecules and decreasing the temperature by 20 K d adding 200 more molecules and increasing the temperature by 20

1 answer

The greatest decrease in pressure will occur with option c) releasing 200 molecules and decreasing the temperature by 20 K.

Decreasing the number of molecules reduces the number of collisions happening in the container, resulting in a decrease in pressure. Additionally, decreasing the temperature decreases the average kinetic energy of the molecules, which further reduces their speed and the number of collisions, leading to a decrease in pressure.