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The mass of an atom is usually listed under their chemical symbol in their specific box on the periodic table. The value is usually given to two decimal places. If you need the molar mass of an entire compound, you will need to calculate it using the molar masses of each individual atom and finding the sum.
Lily Smith wrote:Where do you find the mass of an atom on the periodic table?
I agree with the above post. To find molar mass for a singular atom, you find the atom on the periodic table and look below it. For example, Hydrogen (H) would have an molar mass of 1.0079 while Oxygen (O) would have an molar mass of 16.00. For molar mass of molecules, you add together all the singular atomic masses. For example, water (H2O) would have a molar mass of 18.0158 (16.00 + 1.0079 + 1.0079).
For the element carbon for example (which is pictured here) the number 6 represents the atomic number (the number of protons in the atom) and the number 12.011 is the atomic mass of an element, which is an average of the mass of all of the isotopes of that particular element.
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