JAMB Chemistry 2018 Objective — Question 11
Question 11 of 36 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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20cm³ of a gaseous hydrocarbon was mixed with 150cm³ of oxygen and exploded in a closed vessel at room temperature. After cooling, 110cm³ of gases remained. After absorption by concentrated sodium hydroxide solution, the volume left was 50cm³. The molecular formula of the hydrocarbon is
- A. C₃H₆Correct
- B. C₃H₈
- C. C₄H₁₀
- D. C₄H₈
Explanation
Volume of CO₂ = 110−50 = 60cm³. Total volume of oxygen used = 150−50 = 100cm³. Using ratios derived from the combustion equation and Avogadro's law: the formula works out to C₃H₆ (propene).
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