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Doss [256]
3 years ago
6

6. The reaction of quicklime, CaO, with water produces slaked lime, Ca(OH)2, which is widely used in the construction industry t

o make mortar and plaster. The reaction of quicklime and water is highly exothermic: CaO(s) + H2 O(l) ⟶ Ca(OH)2(s) ΔH = −350 kJ mol−1
Chemistry
1 answer:
vlabodo [156]3 years ago
5 0

Answer:

1) Enthalpy of reaction per gram of quick lime or calcium oxide is -6.25 kJ/g.

2)4.730\times 10^6kilo Joules of energy is produced when 1 Tonn of slaked lime is produced.

Explanation:

CaO(s) + H_2O(l)\rightarrow Ca(OH)_2(s),\Delta H=-350 kJ/mol

Enthalpy of reaction = ΔH = -350 kJ/mol

1 mole of calcium oxide = 56 g/mol

1 ) Enthalpy of reaction per gram of quick lime or calcium oxide:

\frac{\Delta H}{56 g/mol}=\frac{-350 kJ/mol}{56 g/mol}=-6.25 kJ/g

2) Mass of slake lime = 1 Tonn = 1,000,000 g

Moles of slaked lime = \frac{1,000,000}{74 g/mol}=13,513.51 mol

According to reaction, on formation of 1 mol of slaked lime 350 kilo Joules of energy is produced.

Then energy produced when 13,513.51 moles of slaked lime is produced:

350 kJ\times 13,513.51 =4.730\times 10^6 kJ

4.730\times 10^6kilo Joules of energy is produced when 1 Tonn of slaked lime is produced.

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