A certain amount of a metal (at. wt. 27) reacted with excess acid to produce of at STP. What mass of — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

Metal is trivalent ($Al$). $2M + 6H^+ \rightarrow 2M^{3+} + 3H_2$. <br>$\text{moles } H_2 = 3.36 / 22.4 = 0.15$. <br>$\text{moles } M = (2/3) \times 0.15 = 0.1$. <br>$\text{Mass} = 0.1 \times 27 = 2.7 \text{ g}$. [4, 26]