If steel wool (iron) is heated until it glows and is placed in a bottle containing pure oxygen, the iron reacts spectacularly to produce iron(III) oxide.
msp;
1.25 g of iron is heated and placed in a bottle containing 0.0204 mole of oxygen gas, what mass of iron(III) oxide is produced?
Interpretation:
The mass of iron (III) oxide produced should be calculated.
Concept Introduction:
The expected or theoretical yield of the product depends on the limiting reactant of the reaction. Limiting reactant is the reactant that limits the mass of product formed in the reaction.
The balanced chemical equation is as follows:
To calculate the mass of iron (III) oxide, limiting reactant should be calculated first.
Calculate the number of moles of Fe and oxygen gas as follows:
Mass of iron is 1.25 g and molar mass is 55.845 g/mol thus, number of moles will be:
Putting the values,
From the balanced chemical reaction, 4 mol of Fe produces 2 mol of iron (III) oxide or 1 mol of Fe produces 0.5 mol of iron (III) oxide thus, 0.0224 mol of Fe will give
Molar mass of iron (III) oxide is 159.69 g/mol thus, mass can be calculated as follows:
Putting the values,
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