• One serving of peanut butter contains 7 g of protein, 15 g of fat, and 3 g of sugar.
  • The percent composition of a given compound is always the same as long as the compound is pure.
  • Chemists often need to know what elements are present in a compound and in what percentage.Percent composition can also be used to determine the mass of a certain element that is contained in any mass of the compound.
  • The calculations make sense because the sum of the two percentages adds up to 100%.
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