Mg+2HCl→MgCl2+H2\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2Mg+2HCl→MgCl2+H2. What mass of hydrogen is given off by 3.6 g3.6\ \text{g}3.6 g of magnesium?
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