A. A drop of perfume evaporated in an airtight room with a volume V = 60m ^ 3. The perfume drop has m = 10 ^ -4 gr of an aromatic substance with a molecular mass u = 1 kg mol. What is the number of molecules that enter the lungs in each breath, if the volume of the lungs increases in each breath at the rate of V1 = 10 ^ -3 m ^ 3?

B. What is the mass of one of the following compounds: H2O, CO2, PbSO4?