Data Sheet 2 volume of water, ml. mass of container solute, g mass of container,

Question

Data Sheet 2 volume of water, ml. mass of container solute, g mass of container, g mass of solute, g number of moles of solute added initial temperature of water at time of mixing, C extrapolated final temperature of reaction mixture, 12 f mass of calorimeter reaction mixture, g mass of calorimeter, g mass of reaction mixture, g heat transferred during dissolution (Q),J AHdissolution, kJ mol mean AHd kJ mol-1 dissolution, mean AHdissolution of other magnesium salt, kJ mol hydration of anhydrous Mgso kl mol determination X lo

Explanation / Answer

For anhydrous MgSO4,

q = ms (t2 -t1) = 103.653 * 4.184 * 9.4 = 4076.6 J = 4.08 * kJ

moles of MgSO4 = 7.05 / 120 = 0.0588 mol

So, Delta H = q / n = 4.08 / 0.0588 = 69.39 kJ/mol

For MgSO4.7H2O,

q = ms(t2 - t1)

q = 112.568 * 4.184 * 0.1 = 47.10 J = - 0.0471 kJ

moles of MgSO4.7H2O = 15.03 / 246 = 0.0611 mol

delta H = q / n = - 0.0471 / 0.0611 = - 0.771 kJ / mol

Enthalpy of hydration = - 0.771 - 69.39 = - 70.16 kJ

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