The information that the percent composition of an atom in a molecule give is the The total mass that element contributes to a molecule. That is option C.
The percent composition of an atom in a molecule is the total mass/amount of an element present in a molecule/compound to the molecular mass of the compound, multiplied by 100.
The mass of an atom is the amount of matter that is contained in that atom.
When you are calculating the percentage composition of an atom in a molecule this is to find out the mass of the atoms of the element that contributes to the given molecule.
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