[References] Use the References to access important values if needed for this question. The boiling point of ethanol, CH3 CH₂OH, is 78.500 °C at 1 atmosphere. Kb (ethanol) = 1.22 °C/m In a laboratory experiment, students synthesized a new compound and found that when 14.95 grams of the compound were dissolved in 293.3 grams of ethanol, the solution began to boll at 78.570 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound? g/mol Submit Answer Retry Entire Group 9 more group attempts remaining Show Hint Congage Learning Cengage Technical Support Previous Next Save and Exit

A solution is prepared by adding 425g of AgNO3 to 0.150L of water at 40.0∘C. The solubility of AgNO3 at 40.0∘C is 311g100.mL. How many grams of AgNO3 are expected to precipitate if the temperature is dropped to 0.00∘C where the solubility of AgNO3 is only 122g100.mL? Give the answer with three significant figures.

A certain liquid X has a normal freezing point of -3.00 °C and a freezing point depression constant 2.24 °C.kg mol . A solution is prepared by dissolving some ammonium chloride (NH,Cl) in 450. g of X. This K=2 solution freezes at -4.2 °C. Calculate the mass of NH Cl that was dissolved, Be sure your answer is rounded to the correct number of significiant digits. Oxto S.

The common laboratory solvent chloroform is often used to purify substances dissolved in it. The vapor pressure of chloroform , CHCI2, is 173.11 mm Hg at 25 °C. In a laboratory experiment, students synthesized a new compound and found that when 9.963 grams of the compound were dissolved in 278.4 grams of chloroform, the vapor pressure of the solution was 170.58 mm Hg. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight of this compound? chloroform = CHCI3 = 119.40 g/mol. MW = g/mol

4:35 b 18. What is the molar mass of a non-ionic compound if 5.48 grams dissolved in 35.0 grams of benzene (CH) freezes at - 1.39°C? The freezing point of pure benzene is 5.50°C and the freezing point depression constant kip is 5.12°C/m. Molar Masses in g/mol: CH 78.114 CHE 120 General Chemistry II w/Qual Analysis O Spring 2023- Test 1

c) To save money, some state Department of Transportation decided to replace relatively expensive calcium chloride (CaCl2) by more affordable beet juice (mostly made of sugar molecules) in the solutions used to treat the roads before a snow/freezing rain storm. However, the beet juice was not as effective at de-icing the roads as was the calcium chloride solution. When road temperatures were very low, the beet juice treatment did not prevent the water from freezing again. You are called to one of those Departments of Transportation to: 1) Explain that observation and 2) Justify why they should continue to use calcium chloride solutions even if it is more expensive. You may even suggest a cheaper alternative to calcium chloride that will be as effective in road de-icing. Provide your answers below.

The normal freezing point of a certain liquid X is 4.60°C, but when 40.g of iron(III) nitrate (FeNO33) are dissolved in 350.g of X the solution freezes at 3.7°C instead. Use this information to calculate the molal freezing point depression constant Kf of X. Be sure your answer is rounded to the correct number of significiant digits.

What is the boiling point of 0.400 m lactose in water? Use 100.00 °C as the boiling point of water. Be sure your answer has the correct number of significant figures. Note: Reference the Molal freezing point depression and boiling point elevation constants table for additional information. °℃ x10 X

g/mol PHY&CHEM HW Submit Answer Fall 2023 Tutoring S.. The freezing point of ethanol, CH₂CH₂OH, is -117.300 °C at 1 atmosphere. K(ethanol) = 1.99 °C/m In a laboratory experiment, students synthesized a new compound and found that when 13.05 grams of the compound were dissolved in 208.0 grams of ethanol, the solution began to freeze at -117.982 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound? eview Topics] [References] Use the References to access important values if needed for this question. Retry Entire Group 9 more group attempts remaining Previous Next

A certain molecular compound M has a solubility in acetonitrile of 12.6 saturated solution of M in acetonitrile at this temperature. Be sure your answer has the correct unit symbol and 3 significant digits. 0 0 x10 0.0 X Н olo S at 10. °C. Calculate the mass of M required to prepare 500. mL of a