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24 votes
Find the formula mass of the compound, then divide the individual element total by the total mass-move the decimal over two to change it to percentage SnCrO4

User Oly
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1 Answer

6 votes
6 votes

To find the formula mass of tin(ii) chromate we multiply the subscript by the molar mass of that particulat element. If there are no subscript we multiply by 1.


\begin{gathered} Sn:118.7gmol^(-1)*1=118.7amu \\ Cr:52.0gmol^(-1)*1=52.0amu \\ O:16.0gmol^(-1)*4=64amu \end{gathered}

Total mass or formula mass of the compound is:


118.7+52+64=234.7amu

Dividing each element by the formula mass of the compound gives:


\begin{gathered} Sn:(118.7amu)/(234.7amu)*100=50.6\% \\ \\ Cr:(52amu)/(234.7amu)*100=22.1\% \\ \\ O:(64amu)/(234.7amu)*100=27.3\% \end{gathered}

User Alrusdi
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