What is the difference between relative atomic mass and relative formula mass?

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Snoa
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I finding this hard to understand. Thanks
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jo_eli
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The relative atomic mass refers to an atom. You can find it by looking at your periodic table - the mass number is the bigger of the two numbers. (For example, the relative atomic mass of oxygen is 16.0 and the relative atomic mass of hydrogen is 1.0.)
The relative formula mass is the sum of the relative atomic masses of the atoms in the formula of a compound. You can find it by adding up the relative atomic masses of each individual atom in the compound. (For example, the relative formula mass of H2O, which is a compound, is 18.0: (2x1.0) + 16.0 = 18.0.)
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