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21 votes
21 votes
Determine the percentage by mass of each element in the following compounds. (Round your answers to one decimal place.)(a)milk of magnesia, Mg(OH)2Mg:____%O:______%H:______%(b)lye, NaOHNa:____%O:_____%H:_____%

User Solarenqu
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1 Answer

16 votes
16 votes

Firstly we will calculate the mass of the molecule by adding the together the atomic mass of each element:


\begin{gathered} Mg:24.31g \\ O:16.00g \\ H:1.00g \\ _mMg(OH)_2=24.31+(16.00*2)+(1.01*2) \\ _mMg(OH)_2=58.33gmol^(-1) \\ \\ \\ Na:22.99g \\ O:16.00g \\ H:1.01g \\ _mNaOH=22.99+16.00+1.01 \\ _mNaOH=40gmol^(-1) \end{gathered}

Now we will determine the percentage mass of each of element:


User Eric Martin
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