Solve the all parts of given question:
Question: The actual diameter of an atom is about a tenth of a nanometer (10-10 m). In order to develop some intuition for the molecular scale of a gas, assume that you are considering a liter of air (mostly N2 and O2) at room temperature and a pressure of one atmosphere 105 Pa. Put all your answers in the answer box, labeling each one by its letter and putting a blank line between each answer.
Part A: Calculate the number of molecules in the sample of gas.
Part B: Estimate the average spacing between the molecules.
Part C: Estimate the average speed of a molecule using the relation between the KE of a molecule and the temperature.
Part D: Suppose that the gas were rescaled upwards so that each atom was the size of a tennis ball. What would be the average spacing between molecules?
I am having a hard time understanding these questions. So if you answer please explain how you found the answers.