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Q.

Standard enthalpy of vapourisation for $C C l_{4} i s 30.5 k J m o l^{- 1} .$ Heat required for vapourisation of $284 g o f C C l_{4}$ at constant temperature is ____kJ. (Given molar mass in $g m o l^{- 1}; C = 12, C l = 35.5)$

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answer is 56.

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Detailed Solution

Moles of $C C l_{4} = \frac{284}{154} = 1.8$

$\begin{array}{l} Heat required = 1.8 mol \times 30.5 {kJmol}^{-1} \\ = 56.24 kJ \\ = 56 kJ \end{array}$

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