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When 0.75 g of Mg(s) is reacted with excess HCl(aq) in a calorimeter of total heat capacity (container plus contents) of 550.0 J/ºC, what is the expected temperature change ?T? The reaction and enthalpy is given below. 2 Mg(s) + 2 HCl(aq) --> 2 MgCl2(aq) + 2 H2(g) ?H = -456.8 kJ/mol

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