the pressure will decrease b/c ?

Question

A 0.948 mol sample of Kr gas is confined in a 23.5 liter container at 29.3 °C.

If the volume of the gas sample is increased to 47.0 L, holding the temperature constant, the pressure will decrease. Which of the following kinetic theory ideas apply?

Choose all that apply.

 With a larger volume to move in, the molecules hit the walls of the container less often.

 For a given gas at constant temperature, only the number of molecule-wall collisions has an effect on pressure.

 At higher volumes molecules have lower average speeds.

 With lower average speeds, on average the molecules hit the walls of the container with less force.

 None of the Above

Answer 1

 With a larger volume to move in, the molecules hit the walls of the container less often.