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JAMB Chemistry 2024 Paper

Question : 93

Total: 138

_2

_{4(g)}

_{2(g)}

_{2(g)}

_2

_{(g)}

Solution:

Concept:

Gay Lussac’s law of combining volumes states that gases react in simple whole-number volume ratios at constant temperature and pressure.

Explanation:

From the balanced equation:

\mathrm{C_2H_4(g) + 3O_2(g) \rightarrow 2CO_2(g) + 2H_2O(g)}

1

volume of ethene reacts with

3

volumes of oxygen.

Given

10 \, \mathrm{cm^3}

\mathrm{C_2H_4}

, the oxygen needed is:

3 \times 10 \, \mathrm{cm^3} = 30 \, \mathrm{cm^3}

Oxygen available is

50 \, \mathrm{cm^3}

Unreacted oxygen volume:

50 \, \mathrm{cm^3} - 30 \, \mathrm{cm^3} = 20 \, \mathrm{cm^3}

So the residual oxygen gas is

20 \, \mathrm{cm^3}

Answer:

20 \, \mathrm{cm^3}

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