ACT Science Practice Question #1301 (Hard (33)) | Test Citadel
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ACT Science Difficulty: Hard (33)

Digital ACT Science Practice Question #1301

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A physical chemistry student investigated the vapor pressure of four organic liquids at $20^\circ\text{C}$: • Acetone: $24.6\text{ kPa}$, $\Delta H_{\text{vap}} = 31.3\text{ kJ/mol}$ • Ethanol: $5.95\text{ kPa}$, $\Delta H_{\text{vap}} = 38.6\text{ kJ/mol}$ • Water: $2.34\text{ kPa}$, $\Delta H_{\text{vap}} = 40.7\text{ kJ/mol}$ • Ethylene Glycol: $0.008\text{ kPa}$, $\Delta H_{\text{vap}} = 65.6\text{ kJ/mol}$ Based on these data, what is the relationship between the enthalpy of vaporization ($\Delta H_{\text{vap}}$) and the vapor pressure of a liquid at $20^\circ\text{C}$?
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As intermolecular forces strengthen, more energy is required to vaporize molecules (higher $\Delta H_{\text{vap}}$), resulting in fewer molecules in the gas phase and lower vapor pressure....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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