Calculate the enthalpy change for the process
$CCl subscript 4 left parenthesis straight g right parenthesis space rightwards arrow space space straight C left parenthesis straight g right parenthesis space plus space 4 Cl left parenthesis straight g right parenthesis$
and calculate the bond enthalpy of C - Cl in CCl₄(g).
$space increment subscript vap straight H to the power of 0 left parenthesis CCl subscript 4 right parenthesis space equals space 30.5 space kJ space mol to the power of negative 1 end exponent space increment subscript straight f straight H to the power of 0 left parenthesis CCl subscript 4 right parenthesis space equals space minus 135.5 space kJ space mol to the power of negative 1 end exponent space increment subscript straight a straight H to the power of 0 left parenthesis straight C right parenthesis space equals space 715.0 space kJ space mol to the power of negative 1 end exponent comma$
where $increment subscript straight a straight H to the power of 0$ is enthalpy of atomisation and $increment subscript straight a straight H to the power of 0 left parenthesis Cl subscript 2 right parenthesis space equals space 242 space kJ space mol to the power of negative 1 end exponent$

We aim at the equation

The given data implies as under

Multiplying equaton (iv) by 2,

Subtracting equation (i) and (ii) from equation (vi),

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Thermodynamics

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