IB Chemistry SL 2.1.3 Limiting reactant Question Bank

Practise IB Chemistry SL 2.1.3 by applying limiting reactant to exam-style questions.

Exam points

identify the relevant chemical structure, process or evidence
apply the correct chemical model or equation
evaluate the result using chemical reasoning and data

[Maximum number: 3]

Chlorine undergoes many reactions.

(a)

2.67 g of manganese(IV) oxide was added to $200.0 \mathrm{~cm}^{3}$ of $2.00 \mathrm{moldm} \mathrm{m}^{-3} \mathrm{HCl}$ .

\mathrm{MnO}_{2}(\mathrm{~s})+4 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{MnCl}_{2}(\mathrm{aq})

[ 3 ]

(i)

Determine the limiting reactant, showing your calculations.

[ 2 ]

《 $n_{\mathrm{HCl}}=2.00 \mathrm{~mol} \mathrm{dm}^{-3} \times 0.2000 \mathrm{dm}^{3}$ 》 $=0.400 \mathrm{~mol}$

« $\frac{0.400}{4}=$ » 0.100 mol AND $\mathrm{MnO}_{2}$ is the limiting reactant

Marking guidance:

Accept other valid methods of determining the limiting reactant in M2.

(ii)

Determine the excess amount, in mol , of the other reactant.

[ 1 ]

« $0.0307 \mathrm{~mol} \times 4=0.123 \mathrm{~mol}$ »

« $0.400 \mathrm{~mol}-0.123 \mathrm{~mol}=$ » 0.277 «mol»

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2.1.3—Limiting reactant question 1

Question (a)

Question (i)

Question (ii)