1. One of the assumptions is that the heat generated by the reaction is absorbed

Question

1. One of the assumptions is that the heat generated by the reaction is absorbed by pure Calculate nsity 1.0 the mass of HCI, the mass of Mg in your first trial and the mass of water (assume g/mL for the HCl solution). Determine the percentage of water by mass in the support the assumption that the heat is absorbed by water? Explain you ansDoes th mass of wate 2. The calculations of the enthalpy of reaction assume that Mg and MgO are the limiting reagents that this is indeed the case for both the Mg and the MgO experiments.

Explanation / Answer

1. Data not given for calculation

4.

Using standard enthalpy of formation data

(a) dHrxn = dH(products) - dH(reactants)

                = (3 x -924.7 + 2 x -45.6) - (-461.2 + 6 x -285.8)

                = -689.3 kJ/mol

(b) dHrxn = dH(products) - dH(reactants)

                = (-601.7 - 285.8) - (-924.7)

                = 277.4 kJ/mol

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