Lithium iodide has a lattice energy of 7.3×102kJ/mol and a heat of hydration of

Question

Lithium iodide has a lattice energy of 7.3×102kJ/mol and a heat of hydration of 793kJ/mol.

Part A

Find the heat of solution for lithium iodide.

Express your answer using one significant figure.

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Part B

Determine how much heat is evolved or absorbed when 40.0 g of lithium iodide completely dissolves in water.

Express your answer using one significant figure.

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Part C

Is the heat evolved or absorbed?

Lithium iodide has a lattice energy of 7.3×102kJ/mol and a heat of hydration of 793kJ/mol.

Part A

Find the heat of solution for lithium iodide.

Express your answer using one significant figure.

Hsoln =   kJ/mol  

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Part B

Determine how much heat is evolved or absorbed when 40.0 g of lithium iodide completely dissolves in water.

Express your answer using one significant figure.

|q| =   kJ  

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Part C

Is the heat evolved or absorbed?

Is the heat evolved or absorbed? evolved absorbed

Explanation / Answer

The Lattice energy is the amount of energy required to separate a mole of the solid (s) into a gas (g) of its ions.

Lil(s) -------> Li+(g) + l-(g) ....... Hlattice = -730 kJ/mol

Enthalpy of hydration of ions is the amount of energy released when a mole of the ions dissolves in a large amount of water forming an infinite dilute solution in the process,

Li+(g) +l-(g) -----> Li+(aq) +l-(aq) ....Hhyd = -793 kJ/mol

part A

Hsol = 793 kJ/mole - 730 kJ/mole= 63 KJ/mole

Part B

40.0 g LiI * 1mole/134 g * 63KJ/mole heat evolved

18.8 kJ heat evolved

Part C

Heat evolved

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