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For example, for water (Hâ‚‚O): Atomic mass of hydrogen (H) = 1 g/mol Atomic mass of oxygen (O) = 16 g/mol Molar mass of Hâ‚‚O = 2×1 g/mol+16 g/mol=18 g/mol The percentage composition of a ...
\({\%~of~an~element} = \frac{mass~of~an~element~in~the~compound}{relative~formula~mass~M_r} \times 100\) There are six atoms of hydrogen in the compound, so the mass of hydrogen is 6 × 1 = 6.
The example below will show you how to complete this. Tenorite (Cu 2 O) is an ore of copper. Given that copper has a mass of 63.5 and oxygen a mass of 16, calculate the percentage by mass of ...
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