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WAEC Chemistry 2022 Paper

Question : 28

Total: 50

Solution:

Concept:

The mole ratio comes from the coefficients of the balanced chemical equation.

Explanation:

Write the balanced equation for the reaction:

4\,\mathrm{HCl}(g) + \mathrm{O}_2(g) \rightarrow 2\,\mathrm{Cl}_2(g) + 2\,\mathrm{H}_2\mathrm{O}(g)

From this equation, 4 moles of hydrogen chloride produce 2 moles of water.

Thus, the mole ratio of hydrogen chloride to water is:

4:2 = 2:1

This matches option B.

Answer:

2:1

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