When of Aluminium () powder are reacted completely with an excess of aqueous Sodium Hydroxide (), ho — s Block Elements Chemistry Question
Question
When $2 \text{ moles}$ of Aluminium ($Al$) powder are reacted completely with an excess of aqueous Sodium Hydroxide ($NaOH$), how many moles of Hydrogen ($H_2$) gas are evolved?
Answer: 3
💡 Solution & Explanation
Aluminium reacts with aqueous $NaOH$ according to the balanced equation: $2Al + 2NaOH + 2H_2O \rightarrow 2NaAlO_2 + 3H_2 \uparrow$. From the stoichiometry, exactly $2 \text{ moles}$ of $Al$ produce $3 \text{ moles}$ of $H_2$ gas.
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