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JAMB Chemistry 2022 Paper

Question : 23

Total: 40

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Solution:

Concept:

Reacting volumes of gases combine in simple whole-number ratios as shown by the balanced equation.

Explanation:

From the equation,

2\mathrm{H}_2 + \mathrm{O}_2 \rightarrow 2\mathrm{H}_2\mathrm{O}

2

volumes of hydrogen react with

1

volume of oxygen.

Thus,

50\,\mathrm{cm}^3

of hydrogen requires

\frac{50}{2} = 25\,\mathrm{cm}^3

of oxygen.

Oxygen supplied is

75\,\mathrm{cm}^3

, so the unreacted oxygen is

75 - 25 = 50\,\mathrm{cm}^3

Answer:

50\,\mathrm{cm}^3

remains, which is option B.

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