Problem: How many moles of hydrogen gas would be produced for every mole of magnesium added into the HCl solution?Reaction of magnesium metal with hydrochloric acid. The metal is readily oxidized by the acid, producing hydrogen gas, H2(g), and MgCl2(aq).

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How many moles of hydrogen gas would be produced for every mole of magnesium added into the HCl solution?

A series of photographs shows the overall reaction of the reactants 2 HCl (aqueous) plus Mg (solid) going to the products H2 (gas) plus MgCl2 (aqueous). The oxidation numbers in the reactants are: H, positive 1; Cl, negative 1; Mg, 0.  The oxidation numbers in the products are: H, 0; Mg, positive 2; Cl, negative 1. In the first photograph, a spiral of solid Mg is added to a solution of H+ and Cl- ions. In the second photograph, solid Mg is oxidized (loses electrons) and H+ (aqueous) is reduced (gains electrons).  The solution bubbles as the magnesium spiral is dissolved. In the third photograph, the Mg2+ ions are in solution and some H2 gas has been produced.


Reaction of magnesium metal with hydrochloric acid. The metal is readily oxidized by the acid, producing hydrogen gas, H2(g), and MgCl2(aq).


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