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WAEC Chemistry 2018 Paper

Question : 39

Total: 50

Solution:

Concept:

The mole ratio is found by converting the masses of carbon and hydrogen into moles using their atomic masses.

Explanation:

Mass of carbon in

1\,g

of hydrocarbon =

0.93\,g

Mass of hydrogen =

1 - 0.93 = 0.07\,g

Moles of carbon =

\frac{0.93}{12} = 0.0775\,mol

Moles of hydrogen =

\frac{0.07}{1} = 0.07\,mol

Divide both by the smaller value,

0.07

Carbon:

\frac{0.0775}{0.07} \approx 1.1

Hydrogen:

\frac{0.07}{0.07} = 1

Therefore, the mole ratio simplifies to approximately

1:1

Answer:

1:1

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