IB Chemistry SL 1.4.6 Avogadro’s Law Question Bank

Practise IB Chemistry SL 1.4.6 with questions linking gas volume, amount and particle number under Avogadro’s law.

[Maximum number: 1]

Two hydrides of nitrogen are ammonia and hydrazine, $\mathrm{N}_{2} \mathrm{H}_{4}$ . One derivative of ammonia is methanamine whose molecular structure is shown below.

Figure for Question 1.4.6—Avogadro's law question 1 — IB Chemistry SL

Calculate, showing your working, the mass of hydrazine needed to remove all the dissolved oxygen from $1000 \mathrm{dm}^{3}$ of the sample.

Calculate the volume, in $\mathrm{dm}^{3}$ , of nitrogen formed under SATP conditions.
(The volume of 1 mol of gas $=24.8 \mathrm{dm}^{3}$ at SATP.)

\mathrm{n}(\mathrm{N_2H_4})=\mathrm{n}(\mathrm{O_2})=\frac{8.0\,\mathrm{g}}{32.00\,\mathrm{g\,mol^{-1}}}=0.25\,\mathrm{mol}

V(\mathrm{N_2})=0.25\,\mathrm{mol}\times24.8\,\mathrm{dm^3\,mol^{-1}}=6.2\,\mathrm{dm^3}

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1.4.6—Avogadro's law question 1