Two liquid compounds, X and Y, have the same molecular weight. Samples of X & Y

Question

Two liquid compounds, X and Y, have the same molecular weight. Samples of X & Y were placed on temperature probes and allowed to evaporate, as in today’s experimental procedure. Liquid X had an evaporation rate of 1.2 °C/min, and liquid Y had an evaporation rate of 0.4 °C/min. a) Which of the two liquids required more energy to overcome intermolecular forces and evaporate? Explain your answer. b) Which of the two liquids has higher intermolecular forces? Explain your answer. c) Is either of the two liquids likely to have dispersion forces as the only intermolecular force? Which one? Explain your answer.

Explanation / Answer

a) Rate of evaporation of X is higher that means it requires less energy to overcome intermolecular forces. Y needs more energy to overcome intermolecular forces and evaporate.

b) Molecules with higher intermolecular forces needs more energy to break the energy barrier for evaporation. Y is less volatile that means it has more intermolecular forces which held back its molecule towards the liquid phase.

c) Compound X could have dispersion as the only intermolecular force but the compound Y might have stronger forces like hydrogen bonding which makes it less volatile.

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