1.M=m/n 2. D = m / M (a) d is the relative density 3. M / M (a) = what / ρ (a) Help me to explain the meaning of 1 and 2, and can 1 be used to calculate the relative molecular mass of gas and solid? What is density or P in 3 T. P same: V1 / V2 = N1 / N2 (= N1 / N2)

1.M=m/n 2. D = m / M (a) d is the relative density 3. M / M (a) = what / ρ (a) Help me to explain the meaning of 1 and 2, and can 1 be used to calculate the relative molecular mass of gas and solid? What is density or P in 3 T. P same: V1 / V2 = N1 / N2 (= N1 / N2)

1. M = m / N, where m is the amount of substance, M is the mass of substance, and N is the molar mass. For example, if the existing caustic soda M = 20g, what is the amount of substance? If the known molar mass of caustic soda is 40g / mol, then
M=20/40=0.5mol
If you know two of the above three m, m and N, you can find the other one. If you want the molecular weight, you can find the molar mass, because the value of the molar mass is the molecular weight of the substance
2. D = m / M (a) d is the relative density
3. M / M (a) = what / ρ (a) the above two are not standard and without explanation
T. What does N1 / N2 mean when V1 / V2 = N1 / N2 (= N1 / N2)?
At the same temperature and pressure, the volume ratio of gases is equal to their mass ratio. For example, there are 2.24 liters of hydrogen and 4.48 liters of oxygen. What is the mass ratio between them?
V1/V2=n1/n2、2.24/4.48=1/2