Question

among sugar and urea which has low vapour pressure why?
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Answer 1

Lowering of vapour pressure depends on number of moles of solute present. Molar mass of sugar is higher than Urea, so number of moles (in 5% solution) of urea is higher than sugar. Thus lowering of vapour pressure in a 5% solution of urea will be more.

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Answer 2

Answer:

Lowering of vapour pressure depends on number of moles of solute present. Molar mass of sugar is higher than Urea, so number of moles (in 5% solution) of urea is higher than sugar. Thus lowering of vapour pressure in a 5% solution of urea will be more

Explanation:

Vapor pressure of mercury is very low (compared to a liquid like methyl alcohol) because the forces of interaction between the individual metal atoms of mercury is quite a bit stronger than the cohesive molecular forces (such as a hydrogen bonding) that holds together several molecules in case of alcohols,ethers