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- The vapor pressure of pure ethanol is 48 torr at 20°C, while that of pure diethyl ether is 450 torr. The vapor pressure of diethyl ether is 260 torr in the diethyl ether-ethanol mixture when the mole fraction of ethanol is 0.6 in the mixture. Is this an ideal mixture? If not, what is it?When 0.6403 of g calcium bromide is dissolved in 75.00 mL water, the solution temperature increses by 1.07 °C. Calculate the enthalpy of dissolution (ΔHrxn) for calcium bromide, in kj/mol.(Assume constant pressure is, 41.84j/g. °C as the specific heat capacity of the solution, and a density of 1.00 g/ml). Write out the equation. I am confused on where to start with this problem.A student determined the molar mass of an unknown ionic solid by the method used in this experiment. She found the equilibrium temperature of the ice water mixture (THE FREEZING POINT) to be 0.50°C on her thermometer. When she added 3.10 g of her solid to the mixture, the temperature fell to -4.30°C. She then poured off the solution into a beaker. The mass of the solution was 34.59 g. Kf = 1.86°C/m What was the freezing point depression ∆Tf (celsius) What was the molality of the unknown solution? How much water was in the solution? What did she find to be the observed molar mass of the ionic solid, assuming she made the calculation properly?
- 100 200 80 Solubility limit 150 60 Liquid solution (syrup) Liquid solution 40 solid 100 sugar 20 50 Sugar 20 40 60 80 100 Water 100 80 60 40 20 Composition (wt%) Figure Q5 Sugar – water phase diagram Temperature (°C) Temperature (°F)In a binary mixture, the density of ethanol is 0.7880 g cm-3 at 20.00C. Its equilibrium vapor pressure at 20.00C is 40.0 torr. Calculate the change in its chemical potential at this temperature and composition, if its pressure is changed from 40.0 torr to 1 atm. (Hint: recall uj = Gj,m).From your data in Part 1 of the experiment, you calculate the natural log of the partial pressure of water and 1/T value in K for 5 points between 50°C and 80°C. You make a graph of In(P) vs. 1/T and determine that the slope of the linear line is -4800 K. Use this information to calculate AHvap of water. Make sure to use R = 8.314 J mol-1-K-1. Oa. 46.6 kJ/mol Ob. 0.578 kJ/mol Oc. 31.5 kJ/mol O d. 39.9 kJ/mol
- (a) The heat evolved upon dissolution of atmospheric ozone into water is determined to be +5 kcal/mol at 298 K. Given that ozone has a Henry’s constant of 9.4 × 10−3 mol/L/atm at 298 K, determine its Henry’s constant at 273 K. Note that the definition of Henry’s constant is for the process air to water. (b) If the atmospheric ozone concentration in a polluted air is 100 ppbv, what is the concentration in equilibrium with a body of water in that region at 298 K? Note that you need to assume no losses of ozone other than absorption into waterWhen 127. mg of a certain molecular compound X are dissolved in 55.0 g of dibenzyl ether point of the solution is measured to be 1.6 °C. Calculate the molar mass of X. If you need any additional information on dibenzyl ether, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits. ((C6H₂CH₂)₂0), 2 the freezing OO B olo XuThe following table provides some information on carbon dioxide solubility in water. C P k T (mol/L) (atm) (mol/L atm) (°C) 3.70x10-2 1.00 20.0 9.50x10-2 Part A Part B {—| ΑΣΦ What pressure is required to achieve a CO₂ concentration of 9.50x10-² at 20°C? View Available Hint(s) 2.2852 Submit Previous Answers Part C 1.00 www. X Incorrect; Try Again; 5 attempts remaining 20.0 3.40x10-² 25.0 atm At 1 atm, how many moles of CO2 are released by raising the temperature of 1 liter of water from 20°C to 25°C? ►View Available Hint(s)
- Use the following data to determine the AH° for the conversion of diamond into graphite: C(s,diamond) +O2(g) CO,(g) AH°= -395.4 kJ 200,(g) 2c0(g) +0,(g) AH°= 566.0 kJ 2c0(g) C(s,graphite) + CO,(g) AH°= -172.5 kJ C(s,diamond) AH° = → C(s,graphite) kJWhen 80 mg of an unknown white powder found at a crime scene is dissolved in 1.42 mL of ethand density = 0.789g/mL, normal freezing point -114.6 °C, Kf = 1.99 °C/m), the freezing point is lowere -115.6 °C. Which of the following substances could be responsible for this freezing-point depressio (assume the powder is a nonelectrolyte) Show all the work you used to determine the answer. a) meta-tyramine (C8H₁₁NO: MM = 137.182 g/mol) b) sucrose (C12H22O11: MM = 342.2965 g/mol) c) cocaine (C17H21NO4: MM = 303.353 g/mol) d) fructose (C6H12O6: MM = 180.16 g/mol) e) codeine (C18H21 NO3: MM = 299.364 g/mol) of been uov bluow 10cl doum woh (34) For such a phase diagram, a) Do you expect the newly formed bonds (A-B) are stronger than the initial bonds or not? Briefly explain the reason. Is this solution formation reaction endothermic or exothermic? b) Then, is the activity coefficient greater than 1 or not? How would you expect change in volume and change in Enthalpy due to formation of the solution? c) Describe the function (interatomic bond parameter). Explain/compare the bond strength (newly formed A-B vs initial A- A and B-B) depending on sign of the 2-function. T L+α L A Хв B