Chemistry · Organic chemistry – some basic principles and techniques

A high-boiling liquid decomposes at its normal boiling point of \( 563\text{ K} \) under \( 760\text{ mm Hg} \). If the external pressure is reduced to \( 10\text{ mm Hg} \) using a vacuum pump, the liquid boils at \( 453\text{ K} \). What is the vapour pressure of the liquid at this reduced boiling point of \( 453\text{ K} \)?

1. A
   \( 760\text{ mm Hg} \)
2. B
   \( 380\text{ mm Hg} \)
3. C
   \( 0\text{ mm Hg} \)
4. D
   \( 10\text{ mm Hg} \)