Which of the following most likely happens when the number of particles of a gas decreases?

1. The pressure of the gas increases.

2. The pressure of the gas remains the same.

3. The number of collisions of gas particles decreases.

4. The number of collisions of gas particles remains the same.

The answer is:

Explanation:

1. The pressure of the gas increases. I think is incorrect because there is a direct proportion between number of particles and pressure, if the number of particles diminishes, then, the pressure diminishes.

2. The pressure of the gas remains the same. It's incorrect if one diminishes also the other will diminish

3. The number of collisions of gas particles decreases. I think this is the correct one, if there are less particles, then they will interact less and the collisions will decrease.

4. The number of collisions of gas particles remains the same. It's incorrect the number of collisions could not stay the same due to the number of particles is lower.