Why is it necessary to keep temperature the same while comparing vapour pressure?
Answer and explanation
Correct answer: Because vapour pressure changes with temperature
Vapour pressure depends strongly on temperature because temperature changes the kinetic-energy distribution of liquid molecules. A warmer liquid generally has more molecules able to escape, producing a higher vapour pressure. If two liquids are measured at different temperatures, the result mixes temperature effects with composition or intermolecular-force effects, so the comparison is not fair.
Frequently asked questions
What is the correct answer to this question?
Because vapour pressure changes with temperature
Why is this the correct answer?
Vapour pressure depends strongly on temperature because temperature changes the kinetic-energy distribution of liquid molecules. A warmer liquid generally has more molecules able to escape, producing a higher vapour pressure. If two liquids are measured at different temperatures, the result mixes temperature effects with composition or intermolecular-force effects, so the comparison is not fair.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Equilibrium. Topic: Equilibrium in physical and chemical processes.
