Step 1 :

The vapor pressure of $\"\"$ is $\"\"$ at $\"\"$ .

Let us use the Clausius-Clapeyron Equation:

$\"\"$

Where $\"\"$ are vapor pressures.

$\"\"$ are temperatures.

Step 2 :

Substitute $\"\"$ torr, $\"\"$ , $\"\"$ torr, , $\"\"$ and $\"\"$ in Clausius-Clapeyron Equation .

$\"\"$

The heat vaporization of $\"\"$ is $\"\"$ .

Solution :

The heat vaporization of $\"\"$ is $\"\"$ .