4.8 g of magnesium (Mg=24) is added to a solution containing 0.30 mol of HCl: Mg + 2HCl -> MgCl2 + H2. Which statements are correct? Use 22.4 L/mol at STP.

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4.8 g of magnesium ( $Mg = 24$ ) is added to a solution containing 0.30 mol of HCl: $Mg + 2 HCl MgCl X_{2} + H X_{2}$ . Which statements are correct? Use 22.4 L/mol at STP.

Moles of Mg = 0.20; HCl needs only 0.30/2 = 0.15 mol Mg, so HCl is limiting (true).

H X_{2}

= 0.15 mol = 3.36 L (true). Mg left = (0.20 - 0.15) x 24 = 1.2 g (true).

MgCl X_{2}

= 0.15 mol, not 0.20 (false).