7. Use the following data to calculate a value for the enthalpy change of solution of copper (II) chloride, CuCl_(2)(s) Enthalpy change of hydration of CT=-378kJmol^-1 Enthalpy change of hydration or Cu^2+=-2099kJmol^-1 Lattice energy of CuCl_(2)(s)=-2824kJmol^-1 a. -54kJmol^-1 c. 31kJmol^-1 b. -31kJmol^-1 d. 54kJmol^-1

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7. Use the following data to calculate a value for the enthalpy change of solution of copper (II) chloride, CuCl_(2)(s) Enthalpy change of hydration of CT=-378kJmol^-1 Enthalpy change of hydration or Cu^2+=-2099kJmol^-1 Lattice energy of CuCl_(2)(s)=-2824kJmol^-1 a. -54kJmol^-1 c. 31kJmol^-1 b. -31kJmol^-1 d. 54kJmol^-1

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Answer 1

b. -31 kJmol^-1

Answer 2

Untuk menghitung perubahan entalpi pelarutan tembaga(II) klorida, kita perlu mempertimbangkan entalpi perubahan hidrasi dan energi kisi.

1. Enthalpi perubahan hidrasi tembaga(II) klorida:
\[ \Delta H_{hydration} = \Delta H_{hydration\ of\ Cu^{2+}} + \Delta H_{hydration\ of\ Cl^-} \]
\[ \Delta H_{hydration} = (-2099 kJmol^{-1}) + (-378 kJmol^{-1}) \]
\[ \Delta H_{hydration} = -2477 kJmol^{-1} \]

2. Energi kisi tembaga(II) klorida:
\[ \Delta H_{lattice} = -2824 kJmol^{-1} \]

3. Perubahan entalpi pelarutan tembaga(II) klorida:
\[ \Delta H_{solution} = \Delta H_{hydration} - \Delta H_{lattice} \]
\[ \Delta H_{solution} = (-2477 kJmol^{-1}) - (-2824 kJmol^{-1}) \]
\[ \Delta H_{solution} = -31 kJmol^{-1} \]

Dengan demikian, perubahan entalpi pelarutan tembaga(II) klorida adalah -31 kJmol^-1, yang sesuai dengan pilihan b.

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