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In order to find the number of atoms in a molecule you must convert the molecules mass to molar mass, then convert to number of atoms by use of Avagadros number.

Take for instance 5grams of Table salt (NaCl). First we need to get Molar mass in order to determine number of atoms. 1 mole of NaCl is molar mass of one mole of Na (23) + molar mass of one mole of Cl (35) which is equal to = 58grams. Then we divide the mass of our 5grams of Table salt (5) by mass of one mole of our molecule, (58), to get molar mass of our molecule in grams. .08620689. One mole of anything= Avagadros# or 1/1*(6.022*10^23)/1 So for our molecule the equation will look like

5/58*(6.022*10^23)/1=5.1913*10^23.

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