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OpenStudy (anonymous):
The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 31.9 g of the compound?
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thomaster (thomaster):
how many iron atoms are there in 1 molecule \(\large Fe_2O_3\) ?
thomaster (thomaster):
convert 31.9 gram Fe2O3 to moles Fe2O3 Then multiply by avogadro's number ( \(\sf6.022*10^{23}\)) And the last step is to multiply by the number of iron atoms in 1 molecule Fe2O3.
thomaster (thomaster):
To convert gram to mole, divide by the molar mass of Fe2O3
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