Question

How can I calculate the molar mass of a compound?

Answer 1

As we know that molar mass of a chemical compound is the weight of one mole of an element or of a chemical compound. We can calculate the molar mass of a compound by adding the individual atomic masses of all the elements present in the compound.

Complete Solution :
- It is found that the molar mass of a given compound can be calculated by dividing the mass of a given chemical compound or element divided by the number of moles of the substance.
- We can also find the molar mass of an element or chemical compound from the atomic masses of all the atoms in the molecule by just adding the individual atomic masses of all the elements.
- To find the molar mass in case of the multiple atoms of the same element in a compound, multiply the number of atoms with the atomic mass of the element and then add to the atomic masses of other elements.
- Let’s see an example of ${{H}_{2}}O$, the atomic mass of hydrogen is 1 and that of oxygen is 16.
The molar mass of${{H}_{2}}O$ will be:
Molar mass of ${{H}_{2}}O$ = ( 2 X atomic mass of H) + atomic mass of O.
Molar mass of ${{H}_{2}}O$ = ( 2 X 1)g/mol + 16g/mol
Molar mass of ${{H}_{2}}O$ = 18 g/mol
- Hence, in this way we can calculate the molar mass of a compound.

Note: - It should be noted that when we are calculating the molar mass, be careful to multiply the number of atoms of the element with its atomic mass. If we will not do so, then it will result in an incorrect answer.