from the equation, 1 mole of Mg reacts with 2 moles of HCL to give 1 mole of H2 gas.
so for no.of.moles of mg= weight /molecular weight
=54.49/24.3
=2.242 moles of mg
At STP 1 mole of gas occupies 22.4 L of volume
so 1 mole of Mg evolves 22.4 L of H2 or 22400 mL of H2
therefore, 2.242 moles of Mg=2.242*22400
=50220.8 mL of Hydrogen.
=50.228L of H2.
