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The molar mass of iron (III) oxide (Fe₂O3) is 159.7 g/mol. What is the correct way to write the molar
mass of iron oxide as a conversion factor?

159.7 g Fe₂O3
159.7 mol Fe₂O3

1 g Fe₂O3
159.7 mol Fe₂O3

159.7 g Fe₂O3
1 mol Fe₂O3

1 g Fe₂O3
1 mol Fe₂O3



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