Question

If both gases are at the same temperature, which one has the greater pressure?

gas 1 because the particles are moving much faster
gas 1 because it has fewer particles that are close together
gas 2 because it has more particles that are colliding
gas 2 because the particles have more space between them

Answer 1

gas 2 because it has more particles that are colliding 

Answer 2

If both the gases are at the same temperature then they are moving at the same speed.

And one of the gas will have greater pressure if it has more molecules that are colliding as it will produce more pressure.

Hence the right option is:

gas 2 because it has more particles that are colliding.