In a coffee cup calorimeter, a student places 0.390 g of calcium, followed by addition of 50.0 mL of 1.00 M hydrochloric acid. After the reaction took place, a temperature change of 25.3oC was observed. If the reaction solution has the same properties of water and the calorimeter constant is 5.10 J oC-1, what is the enthalpy of reaction in kJ mol-1? (Note: The mass of solution is the mass of all components added.)

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