(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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ORGANIC CHEMISTRY
- Phosphorus 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_forward2. 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_forwardDistinguish between water quality and hydrochemistry.arrow_forward
- How many units of potassium hydroxide are needed to react with 165 molecules of phosphoric acid? 3KOH() + H3PO40)* →K;POo4) + 3H,Omarrow_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_forward24.9 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_forward
- Which of the following can complete the reaction below? ? X÷X NBS/(PhCO2)2 H₂SO4 in boling water H₂, Pt, Ethanol at 130 atm Br₂/FeBr3arrow_forwardNonearrow_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_forward
- If 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_forwardHow does the value for the percent of water in CuSO4· 5 H2O change (increased, decreased, or remain the same) if: a) you did not heat the sample long enough to remove all of the water? b) some of the sample spattered out of the evaporating dish during heating?c) after heating, you wrote 41.698 g as the mass of the evaporating dish + sample instead of 41.598 g? (Explain your thinking).arrow_forwardDistillation is a physical process of separation of liquids that differ in what physical property? Freezing point Degree of size Solubility Melting Point Boiling pointarrow_forward
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