How to calculate Molar Mass
Answers
The molar mass calculation of a substance is complete the following steps (We will use sulfuric acid, H2SO4, as an example):
Make a list of each element and the number of atoms of each element present in the substance.
H 2
S 1
O 4
Go to periodic table and determine the atomic mass average (atomic weight) of each element.
H 1.00794
S 32.066
O 15.9994
Multiply each atomic mass by the number of atoms in the formula.
H 1.00794 * 2 = 2.015
S 32.066 * 1 = 32.066
O 15.9994 * 4 = 63.998
Add up the results of step three:
2.015+32.066+63.998 = 98.079 = molar mass of sulfuric acid
In this example the results have been rounded off to the correct number of decimal places. (Since the atomic mass average of sulfur given above only has 3 decimal places, accuracy can not be determined beyond that point).
These calculations will be necessary before one can determine the molarity or normality of a solution and many other formulas in stoichiometry (the quantitative relationships between chemical substances in a chemical equation).
You can also use this website to find out molar mass-->
https://www.lenntech.com/calculators/molecular/molecular-weight-calculator.htm
⭕️ An element's relative atomic mass is the average mass, of a sample of all its isotopes.
⭕️This information can be found on the periodic table of elements.
➖For example, for hydrogen, the relative atomic mass is 1 for carbon, it is 12
✔️✔️Multiply by the molar mass constant.
⭕️This is defined as 0.001 kilogram per mole, or 1 gram per mole.
⭕️This atomic units to grams per mole, making the molar mass of hydrogen 1.007 grams per mole.
️✔️✔️Examples:-
⭕️CO2 contains 1 atom of Carbon and 2 atoms of oxygen.
⭕️Therefore its molecular mass will be
= 1 X (atomic mass of C) + 2 X (atomic mass of O )
= 1 X (12.011u) + 2 X (16.00 u) = 44.011 u.
⭕️The molar mass will be numerically equal to molecular mass in grams and so will be 44.011 g per mol.......