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WAEC Chemistry 2013 Paper

Question : 19

Total: 47

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_6

. The value of y in the reaction is

Solution:

Concept:

Balancing a chemical equation requires equal numbers of each atom on both sides.

Explanation:

The equation is:

\mathrm{C_2H_2} + y\mathrm{H_2} \rightarrow \mathrm{C_2H_6}

Carbon atoms are already balanced: 2 on each side.

Hydrogen atoms on the left:

2 + 2y

Hydrogen atoms on the right:

6

Equate them:

2 + 2y = 6

2y = 4

y = 2

Answer:

The value of

y

2

Correct option: C.

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