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Binding Energy

in CsF if lat...

Question

in CsF if lattice energy is 750 KJ/mol and heat of hydration of Cs^+1 is 300KJ/mol then what should be heat of hydration of F^-1? (1) 300KJ/mol (2) 250KJ/mol (3) 500KJ/mol (4) 400KJ/mol

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Solution

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C s F_{(s)} \to C s_{(a q)}^{+} + F_{(a q)}^{-}

Δ H = - 40

m o l^{- 1}

750

m o l^{- 1}

C s^{+}

F^{+}

N a^{+}

- 389.4 {kJ mol}^{- 1}

C l^{-}

- 382.3 {kJ mol}^{- 1}

N a C l = + 776 {kJ mol}^{- 1}

Hydration energy ${Δ H}_{h y d r a} . (k J m o l^{- 1})$	Lattice energy $Δ H_{u} (k J m o l^{- 1})$
$L i^{+}$ -499	LiCl-840
$N a^{+}$ -390	NaCl-776
$K^{+}$ -305	KCl-703
$C l^{-}$ -382

A l C l_{3}

= 5137 K J m o l^{- 1}

△ H h y d r a t i o n A l^{3 +} = - 4665 K J / m o l^{- 1}

△ H h y d r a t i o n C l^{-} = - 381 K J / m o l^{- 1}

C s B r (s)

10 k J / m o l

C s^{+} (g)

B r (g)

C s B r (s)

k J / m o l

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