How do you find molar mass?
Look up the atomic masses on the periodic table OR look in a table for the elements. An example:
CaCO3.
Ca = approximately 40
C = approximately 12
O = approximately 16 and 16 x 3 = 48.
Then add all of them.
40 + 12 + 48 = approximately 100. I just rounded all of them to make it a little easier for you to see.
http://www.webelements.com/
Here is a table on the web if you don't have one.
Thank you! but what about for a molar mass for a single element? my teacher said it is different from the atomic mass, but all the research i've done says it is not different.
You are right. Atomic masses are the masses you see in the table or on the periodic chart. I suspect your teacher is talking about the molar mass of elements that are diatomic; i.e., two or more atoms to the molecule. For example, O2 is oxygen = 32 (16 x 2)
O3 is ozone = 48 (16 x 3)
N2, F2, Cl2, Br2, I2, H2, are done the same way. P is P4 and S is S8 in the elemental state. I think most, if not all, of the remaining elements are single atoms to the molecule.
I should have said "polyatomic" or "multiatomic" instead of diatomic. N2, I2, H2, and most of the others I listed are diatomic. Of course, you realize O3, ozone, is triatomic, P4 is tetratomic, and S8 is what? Octatomic?
Oh Okay. I get it!! thank you so much!!
You're quite welcome. Glad to be of help.
To find the molar mass of a chemical compound, you need to know the atomic mass of each element in the compound and the number of each element present. Here's a step-by-step guide on how to find the molar mass:
1. Identify the chemical formula: Begin by writing down the chemical formula of the compound. For example, let's use water, H2O.
2. Look up the atomic masses: Consult the periodic table to find the atomic mass of each element in the compound. The atomic mass is usually located below the symbol of the element. For water (H2O), the atomic mass of hydrogen (H) is approximately 1.01 g/mol, and the atomic mass of oxygen (O) is around 16.00 g/mol.
3. Count the number of atoms: Determine the number of each element in the compound. In water (H2O), there are two hydrogen atoms and one oxygen atom.
4. Multiply atomic mass by the number of atoms: Multiply the atomic mass of each element by the number of atoms of that element in the compound. For water (H2O), multiply the atomic mass of hydrogen (1.01 g/mol) by two and the atomic mass of oxygen (16.00 g/mol) by one.
Hydrogen (H): 1.01 g/mol * 2 = 2.02 g/mol
Oxygen (O): 16.00 g/mol * 1 = 16.00 g/mol
5. Add the masses together: Sum up the masses obtained from the previous step to find the total molar mass of the compound.
Molar mass of water (H2O) = 2.02 g/mol + 16.00 g/mol = 18.02 g/mol
So, the molar mass of water is 18.02 g/mol.