How do I calculate the molecular and molar masses of compounds

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

What is the mass of 8 moles of sodium atoms

The diagrams to the right show the distribution and arrangement of gas particles in two different containers. according to kinetic-molecular theory, which of the following statements is true? check all that apply. if the temperatures of both containers are equal, container a has greater pressure than container b. if the volume of container a decreased, its pressure would decrease. if the pressure in both containers is equal, container a has a lower temperature than container b.