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Volume change in roults positive deviation |
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Answer» take a mixture of ethanol and acetone as an example. When ethanol is mixed with acetone, the hydrogen bonding between ethanol MOLECULES gets disturbed as actone molecules GET in between the ethanol molecules. This results in ΔmixH>0 as heat must be supplied to make the solution from its constituents(as attraction is less) but I am not SURE about ΔmixV. This page says it is greater than zero because VOLUME expands on mixing. But I think it should be less than zero because the observed vapour pressure is more than that predicted on the basis of theoretical calculations, so a greater AMOUNT of solution will be present in the form of vapour, hence volume of solution will be less (than the sum of the volumes of its constituents).hope helpful answer...follow me & mark brienlest answer...☺☺☺ |
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