A mixture of and weighing was completely dissolved in acid and evolved of at STP. Calculate the mass — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
A mixture of $Al$ and $Zn$ weighing $1.67 \text{ g}$ was completely dissolved in acid and evolved $1.69 \text{ L}$ of $H_2$ at STP. Calculate the mass of $Al$ in the mixture.
Answer: $1.24 \TEXT{ G}$
💡 Solution & Explanation
Let mass of $Al$ be $x$. $\text{moles } H_2 = 1.69 / 22.4 \approx 0.0754$. <br>$\frac{1.5x}{27} + \frac{1.67-x}{65.4} = 0.0754$. <br>$0.0556x + 0.0255 - 0.0153x = 0.0754$. <br>$0.0403x = 0.0499 \Rightarrow x \approx 1.24 \text{ g}$.
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