In the Uyeno method for the preparation of hydrogen (often used for military purposes), how many mol — Hydrogen Chemistry Question
Question
In the Uyeno method for the preparation of hydrogen (often used for military purposes), how many moles of hydrogen gas are produced when exactly $2\text{ moles}$ of aluminium ($Al$) react completely with aqueous potassium hydroxide?
Answer: 3
💡 Solution & Explanation
The balanced chemical equation for the Uyeno method is: $2Al + 2KOH + 2H_2O \rightarrow 2KAlO_2 + 3H_2$. Thus, $2\text{ moles}$ of $Al$ yield $3\text{ moles}$ of $H_2$ gas.
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