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Chapter 3: Q3.10 CYL (page 129)

To three significant digits, what is the mass percentage of iron in the compound Fe2O3?

Short Answer

Expert verified

The mass percentage of iron in that compound is 69.942%

Step by step solution

01

Determine mass percentage of the compound

To calculate the percentage composition of iron in that compound we have to know the mass of Fe in a known mass of that compound.

\(\begin{align}{}\% {\rm{ of Fe = }}\frac{{2{\rm{ mol of Fe}}}}{{{\rm{ Molar mass of F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}} \times 100 = \frac{{2 \times 55.845{\rm{ g/mol}}}}{{159.69{\rm{ g/mol}}}} \times 100\\{\rm{ = 69}}{\rm{.942 \% }}\end{align}\)

Hence, the mass percentage of iron in that compound is69.942%

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