How to Calculate Atoms to Moles to Grams
- 1). Divide the number of atoms by Avogadro's number: 6.022 x 10^23 -- to find the number of moles. If you have 5 x 10^24 atoms of nitrogen, for example, divide by 6.022 x 10^23 to get 8.3 moles of nitrogen.
- 2). Look up the element on a periodic table and record the number under the element's symbol in grams per mole to get molecular weight. The symbol for nitrogen is N, for example, and the number under the N on the periodic table is 14.0067, so the molecular weight of nitrogen is 14.0067 g/mol.
- 3). Multiply the molecular weight by the number of moles to get the mass. For 8.3 moles of nitrogen, for example, multiply by 14.0067 g/mol to get 116.26 g of nitrogen.