of a mixture of and is mixed with of and exploded. The contraction in volume is . The ratio of is: — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
$20 \text{ mL}$ of a mixture of $CO$ and $H_2$ is mixed with $20 \text{ mL}$ of $O_2$ and exploded. The contraction in volume is $21 \text{ mL}$. The ratio of $CO:H_2$ is:
Answer: B
💡 Solution & Explanation
$\Delta V = 1.5 V_{CO} + 1.5 V_{H_2}$? No. <br>$CO + 0.5 O_2 \rightarrow CO_2$ ($\Delta V = 0.5$). <br>$H_2 + 0.5 O_2 \rightarrow H_2O(l)$ ($\Delta V = 1.5$). <br>$0.5x + 1.5y = 21$; $x+y = 20$. <br>$0.5x + 1.5(20-x) = 21 \Rightarrow 0.5x + 30 - 1.5x = 21 \Rightarrow x = 9, y = 11$. Ratio $\approx 2:3$.
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