Calculating the amount of substance from mass

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Last updated 11:16 AM on 6/10/26
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4 Terms

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What is molar mass (M)

The mass of one mole of a substance ( g mol-1)

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How do you work out molar mass

The molar mass has the same value as the relative atomic mass, but units are g/ mol

For a molecule , we use the value of the relative molecular mass ( g / mol)

<p>The molar mass has the same value as the relative atomic mass, but units are g/ mol</p><p>For a molecule , we use the value of the relative molecular mass ( g / mol) </p>
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Amount of substance equation

Amount of substance (mol) = Mass (g) / Molar mass (g / mol)

OR moles = mass / mr

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How do we calculate number of atoms

Number of atoms = amount of substance (mol) x avagadros constant