The mass percentage of each element in the milk of magnesia is, 41.68% Mg, 54.86% Oxygen, and 3.46% Hydrogen elements
Give the total mass of a sample of milk of magnesia Mg(OH)₂ as 58.33 g
We are to calculate the percentage by mass of each element
[tex]\% mass =\frac{mass \ of \ element}{mass \ of \ sample} \times 100[/tex]
For Magnesium:
Mass of magnesium = 24.31g
[tex]\% mass \ of \ Mg = \frac{24.31}{58.33} \times 100\\ \% mass \ of \ Mg =\frac{2431}{58.33} \\ \% mass \ of \ Mg = 41.68\%[/tex]
For oxygen element:
Mass of oxygen = 32.00g
[tex]\% mass \ of \ O_2 = \frac{32}{58.33} \times 100\\ \% mass \ of \ O_2 =\frac{3200}{58.33} \\ \% mass \ of \ O_2 = 54.86\%[/tex]
For the hydrogen element
Mass of hydrogen = 2.02g
[tex]\% mass \ of \ H_2 = \frac{2.02}{58.33} \times 100\\ \% mass \ of \ H_2 =\frac{202}{58.33} \\ \% mass \ of \ H_2 = 3.46\%[/tex]
Hence the mass percentage of each element in the milk of magnesia is, 41.68% Mg, 54.86% Oxygen, and 3.46% Hydrogen elements.
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