The mass percent of carbon in pure sucrose, C12H22O11, is 42%. A chemist analyses an impure sample of sucrose and determined that the mass percent is 45%. Which of the following impurities could account for the high mass % of carbon in the sample?

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.