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  2. Jun 19, 2019 · The number of moles in a system can be determined using the atomic mass of an element, which can be found on the periodic table. This mass is usually an average of the abundant forms of that element found on earth. An element's mass is listed as the average of all its isotopes on earth.

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  3. Ask me questions on Facebook: http://www.facebook.com/chemistNATEHow to Calculate the number of moles, given the mass of a substance.n = m / Mwhere n = numbe...

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  4. Perform conversions between mass and moles of a compound. In the previous section , several relationships were written, including: 1 mol Al = 26.98 g Al = 6.022 × 10 23 atoms Al

  5. Keep going! Check out the next lesson and practice what you’re learning:https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-struct...

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  6. Molar Mass. The mass of one mole of atoms/molecules/ions is called its molar mass (M) expressed in g/mol. Numerically, the molar mass is equal to the atomic mass of a given atom or a molecule, so we can look up the molar mass of an element in the periodic table. For example, we can say that the mass of Cu is 63.55 amu or 63.55 g/mol.

  7. Calculating amounts in moles. Key fact. The amount of a given mass substance is calculated using: \ (amount=\frac {mass} {relative~atomic~or~formula~mass}\) Use Ar instead of Mr...

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