**Passage 2:** From the same eudiometry experiment (, initial contraction, ), what is the value of ? — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
**Passage 2:** From the same eudiometry experiment ($10 \text{ mL } C_xH_y$, $25 \text{ mL}$ initial contraction, $20 \text{ mL } CO_2$), what is the value of $y$?
Answer: C
💡 Solution & Explanation
$\text{Initial Contraction} = V_{HC} + V_{O_2 \text{ reacted}} - V_{CO_2} = V_{HC}(1 + y/4)$. <br>$25 = 10(1 + y/4) \Rightarrow 2.5 = 1 + y/4 \Rightarrow y/4 = 1.5 \Rightarrow y = 6$. <br>The hydrocarbon is ethane ($C_2H_6$).
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