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A hydrocarbon contained 14.3% hydrogen. The empirical formula for the hydrocarbon is   [H= 1.0,...

Chemistry
WAEC 2017

A hydrocarbon contained 14.3% hydrogen. The empirical formula for the hydrocarbon is   [H= 1.0, C= 12.0]

  • A. \(CH\)
  • B. \(CH_{2}\)
  • C. \(CH_{3}\)
  • D. \(CH_{4}\)
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Correct Answer: Option B
Explanation

The percentage of Carbon in the compound is (100 - 14.3)%  = 85.7%

          C        :           H

\(\frac{85.7}{12.0}   :      \frac{14.3}{1.0}\)

\( 7.14     :    14.3\)

\(\frac{7.14}{7.14}     :     \frac{14.3}{7.14}\)

\(\approxeq   1  :   2\)

Therefore, the empirical formula is \(CH_{2}\).


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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
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