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JAMB Chemistry 2022 Paper

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Question : 22

Total: 40

An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]

C $_{4}$ H $_{12}$ O
C $_{3}$ H $_{9}$ O
C $_{4}$ H $_{9}$ O
C $_{3}$ H $_{8}$ O

Solution:

C $\frac{69}{12}$ H $\frac{15.3}{1}$ O $\frac{30.7}{16}$

C = 5.75, H = 15.3, O = 1.92

C $\frac{5.75}{1,92}$ H $\frac{15.3}{1.92}$ O $\frac{1.92}{1.92}$

C $_{3}$ H $_{8}$ O

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