Calculate the enthalpy change for the process and calculate the bond enthalpy of C - Cl in CCl 4 (g). where is enthalpy of atomisation and - Wired Faculty

Question

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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 $increment subscript straight a straight H to the power of 0 left parenthesis Cl subscript 2 right parenthesis space equals space 242 space kJ space mol to the power of negative 1 end exponent$

Solution

We aim at the equation
$CCl subscript 4 left parenthesis straight g right parenthesis space space rightwards arrow space space space straight C left parenthesis straight g right parenthesis space plus space 4 Cl left parenthesis straight g right parenthesis comma increment straight H equals ?$
The given data implies as under
$left parenthesis straight i right parenthesis space CCl subscript 4 left parenthesis straight g right parenthesis space space rightwards arrow space space CCl subscript 4 left parenthesis straight g right parenthesis semicolon space space increment straight H to the power of 0 space equals space 30.5 space kJ space mol to the power of negative 1 end exponent left parenthesis ii right parenthesis space straight C left parenthesis straight s right parenthesis space plus space 2 Cl subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow space space CCl subscript 4 left parenthesis straight l right parenthesis semicolon space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space increment straight H to the power of 0 space equals space minus 135.5 space kJ space mol to the power of negative 1 end exponent left parenthesis iii right parenthesis space straight C left parenthesis straight s right parenthesis space space rightwards arrow space straight C left parenthesis straight s right parenthesis semicolon space space space increment straight H space equals space 715.0 space kJ space mol to the power of negative 1 end exponent left parenthesis iv right parenthesis space Cl subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow space space 2 Cl left parenthesis straight g right parenthesis semicolon space space increment straight H space equals space 242 space kJ space mol to the power of negative 1 end exponent$
Multiplying equaton (iv) by 2,
$left parenthesis straight v right parenthesis space 2 Cl subscript 2 left parenthesis straight g right parenthesis space rightwards arrow space space space 4 Cl space left parenthesis straight g right parenthesis semicolon space space increment straight H to the power of 0 space equals space 484 space kJ Adding space equations space left parenthesis iii right parenthesis space and space left parenthesis straight v right parenthesis comma left parenthesis vi right parenthesis space straight C left parenthesis straight s right parenthesis space plus space 2 Cl subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow space space straight C left parenthesis straight g right parenthesis space plus space 4 Cl left parenthesis straight g right parenthesis semicolon space increment straight H to the power of 0 space equals space 1199 space kJ$
Subtracting equation (i) and (ii) from equation (vi),
$straight C left parenthesis straight s right parenthesis space plus space 2 Cl subscript 2 left parenthesis straight g right parenthesis space minus space CCl subscript 4 left parenthesis straight l right parenthesis space minus space straight C left parenthesis straight s right parenthesis space minus space 2 Cl subscript 2 left parenthesis straight g right parenthesis space space space space space space space space space space space space space space space space space space space space space space space rightwards arrow space straight C left parenthesis straight s right parenthesis space plus space 4 Cl left parenthesis straight g right parenthesis space minus space CCl subscript 4 left parenthesis straight g right parenthesis space minus space CCl subscript 4 left parenthesis straight l right parenthesis$
$increment straight H space equals space 1199 minus 30.5 space plus space 135.5 space$
$CCl subscript 4 left parenthesis straight g right parenthesis space rightwards arrow space space space straight C left parenthesis straight g right parenthesis space plus space 4 Cl left parenthesis straight g right parenthesis semicolon space space increment straight H space equals space 1304 space kJ space mol to the power of negative 1 end exponent Bond space enthalpy space of space straight C space minus space Cl space in space CCl subscript 4 left parenthesis average space value right parenthesis space space space space space space space space space space space space equals space 1304 over 4 space equals space 326 space kJ space mol to the power of negative 1 end exponent$

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Thermodynamics

Some More Questions From Thermodynamics Chapter

Classify the following into different types of systems:
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(ii) Tea placed in a tea-pot
(iii) Tea placed in a thermosflask.

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Define an isolated system.

Define intensive properties.

Define extensive properties.

Why all living systems need to be 'open systems'?

Define state variables of a system.

From thermodynamic point of view, to which system the animals and plants belong?

What is a state function?

A thermodynamic state function is a quantity

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