(a)
Interpretation: To determine the intermolecular force and melting point in
Concept Introduction: The attraction force within the molecule should be used to calculate intermolecular force. Other types of adjacent particles, such as atoms or ions, mediate interactions between molecules. Intermolecular forces, such as
(b)
Interpretation: To determine the reason for the high melting point of
Concept Introduction: Intermolecular forces strengthen bonds between molecules, and they can affect a compound's melting as well as boiling points. Generally, the melting or boiling temperatures of a substance rise together with the strength and power of the intermolecular interaction.
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- Ethanoic acid (acetic acid) is verysoluble in water. However, naturally occurring longchaincarboxylic acids, such as palmitic acid(C H 3 (C H 2 ) 14 COOH), are insoluble in water. Explain.arrow_forwardUnder certain conditions, molecules of acetic acid, CH3COOH, form "dimers," pairs of acetic acid molecules held together by strong intermolecular attractions: H H-C-C -- H Draw a dimer of acetic acid, showing how two CH;COOH molecules are held together, and stating the type of IMF that is responsible.arrow_forwardArrange the following in terms of their likely miscibility in water. CH3-CH2-COOH ; CH3-CH2-CH2-COOH; CH3-(CH2)6-COOH ; CH3COOH ;arrow_forward
- When 8.79g of benzoic acid, C7H6O2, are mixed with 325g of phenol, the mixture freezes at 39.26°C. The freezing point of pure phenol is 40.90°C. What is the freezing point constant for phenol?arrow_forwardArrange the following compounds in order of increasing vapor pressure. NH PH C А Вarrow_forwardPhosphorus pentachloride reacts violently with water togive a mixture of phosphoric acid and hydrochloric acid.(a) Write a balanced chemical equation for this reaction.(b) Determine the concentration (in moles per liter) of each of the acids that result from the complete reaction of 1.22 L of phosphorus pentachloride (measured at 215°C and 0.962 atm pressure) with enough water to give a solution volume of 697 mL.arrow_forward
- 2. What is the freezing point of a solution prepared by adding 150. g trichothecin (C19H24O5) to 0.867 kg ofbenzene? The freezing point of pure benzene is 5.5 °C. The freezing point constant for benzene is 5.12 °C/m.arrow_forwardPredict the water solubility of each compound: (a) KCl; (b) methanol (CH 3OH); (c) hexane (C 6H 14).arrow_forwardAn aqueous solution is 20.0% by mass of sodium thiosulfate pentahydrate, Na, S2 O3-5H2O. What is the molarity of Na2 S2 O3 in this solution at 20°C? The density of this solution at 20°C is 1.173 g/mL. mol/L Molarity =arrow_forward
- 24.9 g of an unknown molecular solute is dissolved in 5.01 moles of 1,2-ethanediol (C2H6O2), causing the freezing point of 1,2-ethanediol to decrease by 3.32 °C. Calculate the molar mass of the solute. For 1,2-ethanediol, the molar mass is 62.07 g/mol and Kf = 3.11 °C/m.arrow_forwardComplete combustion of 8.653 g of a compound of carbon, hydrogen, and oxygen yielded 21.83 g CO₂ and 3.831 g H₂O. When 18.00 g of the compound was dissolved in 288 g of water, the freezing point of the solution was found to be -0.952 °C. For water, Kfp = = 1.86 °C/m. What is the molecular formula of the compound? Enter the elements in the order C, H, O molecular formula =arrow_forwardIf one mixes 50 cm3 of EtOH and 50 cm3 of H2O at room temperature; will the total volume of the solution will be 100.0 cm3? Justify your answer with appropriate calculations and explanations.arrow_forward
- Chemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning