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WAEC Chemistry 2018 Paper

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Question : 39

Total: 50

Analysis of a hydrocarbon shows that it contains 0.93g of Carbon per gram of the compound. The mole ratio of carbon to hydrogen in the compound is [H = 1.0, C=12.0]

1:1
1:2
2:1
2:3

Solution:

1g of Hydrocarbon = 0.93g of Carbon, therefore, Hydrogen = (1 - 0.93)g = 0.07g

C : H

0.93 : 0.07

$\,\frac{0.93}{12}$ : $\,\frac{0.07}{1}$

0.078 : 0.07

$\,\frac{0.078}{0.07} : \,\frac{0.07}{0.07}$

$\approx \text{eq} \, 1:1$

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