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Magnesium pieces (0.492 g) react in dilute acidic solution (134 mL) as follows:Magnesiumstukke (0.492 g) reageer in verdunde suuroplossing (134 mL) soos volg:
Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)

The temperature of the solution increases from 22.2 °C to 44.8 °C. Determine the enthalpy change for the reaction in kJ per mol Mg(s) that reacts.

(Assume that the specific heat capacity of the solution, and density of HCl(aq) can be approximated by the values for pure water. Furthermore, no heat energy is exchanged with the calorimeter). 

Die temperatuur van die oplossing styg van 22.2 °C tot 44.8 °C. Bepaal die entalpieverandering vir die reaksie in kJ per mol Mg(s) wat reageer.

(Neem aan dat die spesifieke hittekapasiteit van die oplossing en die digtheid van HCl(aq) benader kan word deur die waardes vir suiwer water te gebruik. Verder word geen hitte-energie met die kalorimeter uitgeruil nie).

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