Question

in table 3.5, why are the mass ratios of copper to chlorine not the same for compound i and compound ii? experimental error the copper changes to chlorine in compound ii there is another element not shown the two compounds are not the same

Explanation:

Different compounds have different chemical compositions. The mass - ratio of elements in a compound is characteristic of that compound. Since compound I and compound II are different compounds, their mass ratios of copper to chlorine are different.

Answer:

the two compounds are not the same