10
Feb
The primary components of air are 78 n 2 and about 21 o 2. When adding those two values together you get 28 5 g which is extremely close to the accepted value of the molecular weight of air 28 97 g.
Composition and content of each gas in air is given in the figures and the table below.
Molar mass of air. M i the molar mass of each gas. The molar mass of dry air with oxygen nitrogen and the other components as indicated below is 28 9647 g mol. Composition and content of each gas in air is given in the figures and the table below.
What this number means is that one mole or one molecular measure of air that contains 6 0221367 x e 23 molecules of gas weighs 28 9656 grams at standard atmospheric conditions of 60 degrees fahrenheit and 14 696 pounds per square inch absolute psia. Molar mass of dry air 0 0289654 kg mol molar mass of water vapor 0 018016 kg mol universal gas constant 8 314 j k mol the vapor pressure of water may be calculated from the saturation vapor pressure and relative humidity. It is found by.
The molecular weight of air is approximately 28 97 g mol. The molecular mass is estimated using the weights of all of the elements contained in air. Hence the molar mass of dry air is 28 96 g mol.
In english units the standard unit of measurement of molecular mass of air is lbm lbmol pound mass pound mole. The actual value of molar mass of air remains the same as the fractions of its constituents which are taken into consideration for the calculations. More information on molar mass and molecular weight.
In chemistry the formula weight is a quantity computed by multiplying the atomic weight in atomic mass units of each element in a chemical formula by the number of atoms of that element present in the formula then adding all of these products together. M i the molar mass of each gas. The molar mass of dry air is 28 9647 g mol.
Composition and content of each gas in air is given in the figures and the table below. The primary components of air are 78 n 2 and about 21 o 2. The accepted value for air at 28 97 g mol makes sense because 78 of the mol is nitrogen and 21 of the mol is oxygen.
21 of the molar mass of o 2 is about 6 7 g and 78 of the molar mass of n 2 is about 21 8 g. When adding those two values together you get 28 5 g which is extremely close to the accepted value of the molecular weight of air 28 97 g. The molar mass of atoms of an element is given by the relative atomic mass of the element multiplied by the molar mass constant m u 1 000 000 10 3 kg mol 1 000000 g mol.
For normal samples from earth with typical isotope composition the atomic weight can be approximated by the standard atomic weight or the conventional atomic weight.