Question

Which of the factors are responsible for the conversion of solid $C{O}_2$ in vapours?

• A. Increase in temperature and pressure
• B. Decrease in temperature and pressure
• C. Increase in pressure and decrease in temperature
• D. Increase in temperature and decrease in pressure

Answer 1

The correct option is D

Increase in temperature and decrease in pressure

As the temperature increases then the vibrational kinetic energy of the molecules increases and molecules overcome the force of attraction between adjacent molecules and this increases the intermolecular distance between them and hence solid $C{O}_2$ converts to vapours (Sublimation). The decrease in pressure will lead to an increase in intermolecular spaces between molecules and hence solid $C{O}_2$ converts to vapours (Sublimation).