can anyone plz help me in this conceptual questions?

Question

1)When u climb a mountain your eardrums “pop” out ward as the air pressure decreases. When you come down they pop inward as the pressure increases. At the sea cost there is cave that can be entered only by swimming through a completely submerged passage and emerging into a pocket of air within the cave. The cave is not vented to external atmosphere. As the tides comes in the water level in the cave rises and your eardrums pop. Is the popping analogous to wht happen as you climb up or down a mountain? Give ur reasoning..

2)The kinetic theory assumes that a gas molecular rebounds with the same speed after colliding with the wall of container. Suppose the speed after the collision is less thn that before the collision would the pressure of the gas be greater thn equal to or less thn that predicated by kinetic theory? Give reason.

3)a)which if either contain a greater number of molecular a mole of hydrogen or mle of oxygen? B) which one has more mass? Give ur reason?

Answer 1

1) It's analogous to coming back down the mountain. The pressure in the pocket of air increases as the rising water forces the air to be confined into a smaller area.

2) The pressure would decrease. The collision would leave the gas molecule with less energy so its temperature would decrease and pressure is directly related to temperature.

3) a.The definition of mole guarantees that a mole of hydrogen and a mole of oxygen have the same number of molecules. That number is given by Avogadro's number: 6.023*10^23 molecules in a mole.
b.The oxygen atom (16.000) is heavier than a hydrogen atom (1.008) so a mole of oxygen is has more mass.