Remember, the sum of the mass percentage of each element ...
Remember, the sum of the mass percentage of each element in the compound must equal 100%.
For example, to calculate the mass percentage of each element in K2Cr2O7 we need to know the following:
the atomic weight of each element (from the periodic table)
the formula weight of the compound
K2Cr2O7 = 294.2 amu
the number of times each element appears in the chemical formula (from the subscripts)
The calculations are therefore as follows:
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** (note : Rounding of Atomic Weights)
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