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  4. 12 g of Mg (at. mass 24) on reacting completely with acid gives hydrogen gas, the volume of which at STP would be

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Q. $12 \,g$ of $Mg$ (at. mass $24$) on reacting completely with acid gives hydrogen gas, the volume of which at STP would be

Some Basic Concepts of Chemistry

Solution:

$Mg + 2HCI\to MgCL_2 + H_2$
$\because24 g Mg$ evolves $22.4 L H_2$ at $STP$
$\therefore 12 g Mg$ evolves $H_2$ at $STP\frac{22.4}{24}\times12 = 11.2\, L\, at\, STP$