Molar Mass
The molar mass of an element or a compound says how many individual atoms are found in a sample of the element or compound you are finding the molar mass of. The molar mass of an element is just the atomic mass that is found on the periodic table. In a compound, the molar mass is the sum of all of the atomic masses of all elements present in the compound. The molar mass is expressed in terms of #g/mole.
Calculating Molar Mass |
In order to calculate the molar mass, you'll need to first need to identify the element or the compound that you are trying to find the molar mass of.
If it is an element...
The molar mass of an element is just the atomic mass of the element found on the periodic table. You'll simply just take the atomic mass of that element and write it with the unit g/mole.
If it is a compound...
You'll need to know all of the element that make up the compound and the number of each element found in that compound. You would then take the atomic mass of each element and multiply that atomic mass by how many of that element is present in that compound.
Examples:
Molar Mass of Elements
The molar mass of individual elements is just the atomic mass found on the periodic table.
Boron:
10.811g/mole
Nitrogen:
14.00674g/mole
Chlorine:
35.4527g/mole
Molar Mass of Compounds
Glucose (C6H12O6):
Carbon's Atomic Mass ---> 12.011
Hydrogen's Atomic Mass ---> 1.00794
Oxygen's Atomic Mass ---> 15.9994
Since there are 6 carbons in glucose, you'd multiply the atomic mass of carbon by 6. Similarly, you'd multiply the atomic mass of hydrogen by 12 since there are 12 hydrogens in glucose, and you'd multiply the atomic mass of oxygen by 6 since there are 6 oxygens in glucose.
(12.011)*(6) = 72.066
(1.00794)*(12) = 12.09528
(15.9994)*(6) = 95.9964
You would then take these calculated atomic masses and add them together to get the molar mass of glucose.
72.066 + 12.09528 + 95.9964 = 180.15768
The molar mass of glucose (C6H12O6) is 180.15768g/mole.
If it is an element...
The molar mass of an element is just the atomic mass of the element found on the periodic table. You'll simply just take the atomic mass of that element and write it with the unit g/mole.
If it is a compound...
You'll need to know all of the element that make up the compound and the number of each element found in that compound. You would then take the atomic mass of each element and multiply that atomic mass by how many of that element is present in that compound.
Examples:
Molar Mass of Elements
The molar mass of individual elements is just the atomic mass found on the periodic table.
Boron:
10.811g/mole
Nitrogen:
14.00674g/mole
Chlorine:
35.4527g/mole
Molar Mass of Compounds
Glucose (C6H12O6):
Carbon's Atomic Mass ---> 12.011
Hydrogen's Atomic Mass ---> 1.00794
Oxygen's Atomic Mass ---> 15.9994
Since there are 6 carbons in glucose, you'd multiply the atomic mass of carbon by 6. Similarly, you'd multiply the atomic mass of hydrogen by 12 since there are 12 hydrogens in glucose, and you'd multiply the atomic mass of oxygen by 6 since there are 6 oxygens in glucose.
(12.011)*(6) = 72.066
(1.00794)*(12) = 12.09528
(15.9994)*(6) = 95.9964
You would then take these calculated atomic masses and add them together to get the molar mass of glucose.
72.066 + 12.09528 + 95.9964 = 180.15768
The molar mass of glucose (C6H12O6) is 180.15768g/mole.