Please help me out with Chemistry.

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Description

Two liquid compounds, A and B, have the same molecular weight.  Samples of A & B were placed on temperature probes and allowed to evaporate, as in today's experimental procedure.  After 105 seconds, Liquid A had a ΔT of 10.2ºC, and liquid B had a ΔT of 3.7ºC.

1.  Which of the two liquids required more energy to overcome intermolecular attractions and evaporate?  Explain your reasoning.

2.  Which of the two liquids has higher intermolecular attractions?  Explain your reasoning.

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Explanation & Answer

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liquid B requires more energy to overcome the inter-molecular attractions. This is because for a liquid to evaporate or boil the intermolecular forces must be broken first. Since liquid B had a lower change in temperature this means that it has stronger intermolecular forces that are not easily overcome by heat. 

As indicated liquid B  has higher intermolecular forces since they require more energy to break

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