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0.50 g of Mg is added to a 50 mL HCl solution. The temperature increased by 5.2 degree Celsius. Calculate the enthalpy change for the reaction per mole of Mg that reacted.

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  • $\begingroup$ What is the concentration of the HCl solution? Did all the Mg react? $\endgroup$ – Karsten Theis Nov 21 '19 at 4:14
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We assume all the Mg reacts, which means that $\frac{1}{48}$ mol of Mg reacts with 50 ml

The enthalpy change for $\frac{1}{48}$ mol is given by $\Delta H = mC\Delta T = 50 \times 4.186 \times 5.2 \space J$

Therefore, the enthalpy change per mole is $48 \times \Delta H = 52.241 \space kJ \space mol^{-1}$

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