Assume that each of the gases in the dead atmosphere behaves as an ideal gas independently obeying the barometric pressure equation. Also assume that the temperature of the atmosphere does not change with height and is equal to 273K. Also assume that the composition of the atmosphere on the surface of the earth is 20% oxygen and 80% nitrogen. Under the given assumptions:

A. At what height did the partial pressure of each of the gases drop to half its value on Earth?

B. At what height above the earth's surface will the composition of the atmosphere be 90% nitrogen and 10% oxygen?

C. Would the answer to B change if the mass of the Earth was the same as the mass of Mars (about 10 times smaller than the mass of the Earth)? If so, explain whether the height would decrease or increase. If not, explain why. d. Which of the assumptions in the question is less likely and will have a greater effect on the composition of the atmosphere at a given height in practice?