MediumChemistryHigh School (11–12)The d- and f-Block Elements › Transition Elements (d-Block)Numerical

Sulfur dioxide, 160 g with a molar mass of 64.0 g/mol, passes over vanadium(V) oxide, and 90.0 % of…

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Sulfur dioxide, $160\ \text{g}$ with a molar mass of $64.0\ \text{g/mol}$ , passes over vanadium(V) oxide, and $90.0\ \%$ of it is oxidised: $2\text{SO}_2 + \text{O}_2 \rightarrow 2\text{SO}_3$ . Each $\text{SO}_2$ gives 2 electrons to the catalyst. Find the moles of $\text{SO}_3$ formed, the mass of oxygen used (molar mass $32.0\ \text{g/mol}$ ) and the moles of electrons that pass through the catalyst.

Need a reminder? The key ideaShow

Moles = mass in g divided by molar mass in g/mol, or concentration in mol/L times volume in litres. Take every mole ratio from the balanced equation, and follow the chain one step at a time.

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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