Denise combines 0.2 g of Mg metal with HCl and gets a final V of 234 mL which completely reacts (Mg + HCl = MgCl2 + H2). Tsolution changes from 23.8 degrees C to 33 degrees C. The solution's density is 1 g/mL and Cs,H2O = 4.18 J/g degrees C. What is qrxn?

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