2Fe2O3 + 3C 4Fe + 300, When 9.20 moles of carbon dioxide are produced from the reaction above, how many moles of Iron(III) Oxide must have been present before the reaction took place?

3.1 moles of Iron(III) Oxide

Explanation:

The equation of the reduction of iron III oxide using carbon is shown;

Fe2O3 + 3CO → 2Fe + 3CO2

From the reaction equation;

1 mole of  Iron(III) Oxide yielded 3 moles of carbon dioxide

x moles of Iron(III) Oxide will yield  9.20 moles of carbon dioxide

x = 9.2 moles * 1 mole/3 moles

x = 3.1 moles of Iron(III) Oxide

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

the answer would be b i believe