Problem: Calculating the mass percentages of the elements in benzene after calculating the molecular weight of benzene.

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We are asked to calculate for the percent by mass (mass %) of each element in benzene (C6H6) and to do that we’re going to use the mass percent formula shown below:


%Mass = mass of elementtotal mass×100


First, we need to get the atomic weights of each element in benzene using the periodic table and then calculate its molar mass.

Mass of C:

6 x 12.01 g/mol C = 72.06 g C

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Problem Details

Calculating the mass percentages of the elements in benzene after calculating the molecular weight of benzene.