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As I understand your question, “the two” refers to Zinc Gluconate and Zinc Ascorbate. Zinc gluconate and zinc ascorbate are distinctly different compounds. They are both adducts of Zn with one Zn and two bidentate oxygen-based ligands of organic acids. Some basic information from PubChem for both zinc gluconate and zinc ascorbate is given below. Zinc ...


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In $\ce{H2O}$, the proportion of $\ce{H}$ counted by atoms is $\ce{2/3 = 66.7}$ %. In the same $\ce{H2O}$, the mass of $\ce{2 H}$ is $2$ u. As the mass of $\ce{1 O}$ is $16$ u, the proportion of H by mass in $\ce{H2O}$ is $2/18 = 11.1$%. This percentage $11.1$% is rather different from $66.7$%


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