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WAEC Chemistry 2014 Paper

Question : 39

Total: 45

Solution:

Concept:

Use the mole ratio from the balanced chemical equation to relate ethene and water.

Explanation:

The balanced equation is given as:

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

From the equation,

1

mole of ethene produces

2

moles of water.

So, the mole ratio of ethene to water is

1:2

Given that the amount of water produced is

0.1

mole.

Therefore, moles of ethene required

= \dfrac{0.1}{2} = 0.05

mole.

Answer:

0.05

mole

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