af Formation of MgO v. CALCULATIONS In 1. Calculate the heat transferred to the

Question

af Formation of MgO v. CALCULATIONS In 1. Calculate the heat transferred to the water by the reaction of Mg(s) HCl(aq) C 2. Calculate AH in kJ/mol for reaction (1) of Slog 24-3065 tooo T o o 85 Mo 3. Calculate the heat transferred to the water by the reacti of Mgo(s)+HCl(aq). 4. Calculate AH in kJ/mol for reaction (2) 0, 30 Mao 5. Use Hess' Law to determine AH for reaction (4). SHow the WORK H Thermodynamics is a funny subject. The first time you go through it, you donn understand it at all. The second time you go through think you understand except for one or two small points. The third time you go through it, you know you don't understand it, but by that time you are so used to it,itdoesnt bother you any more. Armola Sommerfeld

Explanation / Answer

(4)

reaction 2 is

MgO (s) + 2 HCl (aq.) --------------> MgCl2 (aq.) + H2O(l)

Mass of MgO taken = 1.30 g.

Molar mass of MgO = 40 g/mol

Moles of MgO = mass / molar mass = 1.3 / 40 = 0.0325 mol

It is given that,

for 1 mol of MgO, change in enthalpy = - 133.61 kJ

Then, for 0.0325 mol of MgO, change in enthalpy = - 133.61 * 0.0325 = - 4.34 kJ

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