The boiling point of carbon tetrachloride is
`77^(@)C` and its heat of vaporisation is `"31 kJ mol"^(-1)`.
Calculate the vapour pressure of carbon
tetrachloride in atmospheres at `25^(@)C`.

Explanation

To calculate the vapor pressure of carbon tetrachloride (CCl₄) at 25°C, we can use the Clausius-Clapeyron equation, which relates the vapor pressure at two different temperatures to the heat of vaporization. The equation is given by:

\[ \ln \left( \frac{P_2}{P_1} \right) = -\frac{\Delta H_{vap}}{R} \left( \frac{1}{T_2} - \frac{1}{T_1} \right) \]

Where:
- \( P_1 \) is the vapor pressure at the boiling point (1 atm, since it is boiling).
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