How much force does the gas exert on one of the walls of

Question

1) There are 1.5 times as many molecules as Avogadro's number at a temperature of 2.5°C inside a sealed cube with dimensions 1.2 cm ? 1.2 cm ? 1.2 cm. How much force does the gas exert on one of the walls of the cube?

________N

2) What is atmospheric pressure on top of Mt. Everest on a day when water boils there at a temperature of 70.0°C?

________N/m^2

3) A deep sea diver should breathe a gas mixture that has the same oxygen partial pressure as at sea level, where dry air contains 20.9% oxygen and has a total pressure of 1.01 ? 10⁵ N/m².

(a) What is the partial pressure (in N/m²) of oxygen at sea level? ________N/m^2

(b) If the diver breathes a gas mixture at a pressure of 3.00 ? 10⁶ N/m², what percent oxygen should it be to have the same oxygen partial pressure as at sea level?

___________%