Magnesium metal reacts with hydrochloric acid according to

CHEMISTRY · Subjective · A Level · Chemistry · Amount of substance · Amount of substance

Problem

Magnesium metal reacts with hydrochloric acid according to Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g)\text{Mg}(s)+2\text{HCl}(aq)\rightarrow \text{MgCl}_2(aq)+\text{H}_2(g), with ΔH1=−466 kJ\Delta H_1=-466\,\text{kJ} per reaction as written. Any magnesium that remains unreacted then burns in air: 2Mg(s)+O2(g)→2MgO(s)2\text{Mg}(s)+\text{O}_2(g)\rightarrow 2\text{MgO}(s), with ΔH2=−1203 kJ\Delta H_2=-1203\,\text{kJ} per reaction as written. A sample containing 10.0 g10.0\,\text{g} of Mg\text{Mg} is added to 0.300 mol0.300\,\text{mol} of HCl\text{HCl} at constant pressure. After all reactions are complete, calculate the total heat qq released (include sign).

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