Use the observation in the first column to answer the question in the second column.observation questionAt 50°C, Substance A has a vapor pressure of 137.torr and Substance B has a vapor pressure of 167.torr. Which has a higher boiling point?Substance ASubstance BNeither, A and B have the same boiling point.It's impossible to know without more information.The enthalpy of vaporization of Substance C is smaller than that of Substance D. At any temperature where both substances are liquid, which has the higher vapor pressure?Substance CSubstance DNeither, C and D have the same vapor pressure.It's impossible to know without more information.At 1atm pressure, Substance E boils at 98.°C and Substance F boils at 118.°C. Which has a higher vapor pressure?Substance ESubstance FNeither, E and F have the same vapor pressure.It's impossible to know without more information.
Question
Use the observation in the first column to answer the question in the second column.observation questionAt 50°C, Substance A has a vapor pressure of 137.torr and Substance B has a vapor pressure of 167.torr. Which has a higher boiling point?Substance ASubstance BNeither, A and B have the same boiling point.It's impossible to know without more information.The enthalpy of vaporization of Substance C is smaller than that of Substance D. At any temperature where both substances are liquid, which has the higher vapor pressure?Substance CSubstance DNeither, C and D have the same vapor pressure.It's impossible to know without more information.At 1atm pressure, Substance E boils at 98.°C and Substance F boils at 118.°C. Which has a higher vapor pressure?Substance ESubstance FNeither, E and F have the same vapor pressure.It's impossible to know without more information.
Solution
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Substance A has a higher boiling point. The boiling point of a substance is inversely proportional to its vapor pressure. Since Substance A has a lower vapor pressure at the same temperature, it has a higher boiling point.
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Substance C has a higher vapor pressure. The enthalpy of vaporization is the amount of energy required to convert a substance from a liquid to a gas. If Substance C has a smaller enthalpy of vaporization, it means it requires less energy to convert to a gas, and therefore it has a higher vapor pressure.
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Substance E has a higher vapor pressure. The boiling point of a substance is the temperature at which its vapor pressure equals the external pressure. Since Substance E boils at a lower temperature, it means its vapor pressure reaches 1 atm at a lower temperature, and therefore it has a higher vapor pressure.
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