The freezing point of benzene is 5.5 °C. What is the molar mass of a nonionizing solute if 1.06 grams of the solute added to 24.83 g of benzene lowers the freezing point to 3.97. The Kf of benzene is -5.12 °C/m. Record your answer as a whole number.
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The freezing point of benzene is 5.5 °C. What is the molar mass of a nonionizing...
1.The freezing point of benzene is 5.5 °C. What is the molar mass of a nonionizing solute if 1.99 grams of the solute added to 20.62 g of benzene lowers the freezing point to 3.44. The Kf of benzene is -5.12 °C/m. Record your answer as a whole number. 2.Water has a Kf of -1.86 °C/m. Calculate the new freezing point of an aqueous solution made by mixing 38.66 g water and 1.64 g MgCl2. 3.Ethanol has a Kb of...
The molar mass of unknown molecular compound is determined using freezing point depression. The substance is dissolved in benzene (C6H), an organic solvent. Use the data below to determine the molar mass of the substance. 8.65 g Mass of unknown compound Freezing point of solution Volume of benzene -10.21°C 35.0 mL 5.53°C Freezing point of benzene Density of benzene Kf for benzene 0.8765 g/mL 5.12°C/m Molar mass = g/mol
1)The freezing point change for a solution containing naphthalene (a nonvolatile, nonionizing compound) in 250. g of liquid benzene is 10.2°C. What is the amount (moles) of naphthalene in the solution? (Kf = 5.12°C/m for benzene) 2)Acidic acid is a strong acid. a)True b)False
A nonvolatile, non-dissociating solute was dissolved in 12.0 g of benzene (C6H6). The freezing point of the solution was measured as 1.3 °C, while pure benzene freezes at 5.5 °C. If pure benzene has a vapor pressure of 75 torr, what is the vapor pressure of this solution. For benzene, Kf = 5.12 °C/m and Kb = 2.53 °C/m.
When 12.6-grams of an unknown compound is placed in 0.116-kg of benzene, the freezing point is changed by 2.34°C. The value of Kf= 4.90°C/m for benzene. Determine the molar mass of the unknown compound. Answer to 1 decimal place and include your units. Answer: Determine the molality of a solution when 32.3 grams of ethanol, C2H5OH (Molar mass = 46.08 g/mol) is dissolved in 0.947 kg of water. Answer to 2 decimal places. Answer: Find the freezing point of a...
1.A solution that contains 15.581 grams of benzene (molar mass = 78.1 g/mol) in 420 g of cyclohexane freezes at a temperature 9.50 ºC below the freezing point of pure cyclohexane. Calculate the molar freezing point depression constant, Kf, for cyclohexane. 2. The molar boiling point elevation constant for water is 0.512 ºC/m. What is the boiling point of a solution containing 673 g of water and 78.0 g of CaCl2? 3. A solution containing 32.0 g of an unknown...
What is the freezing point (in K) of a solution made by dissolving 19.831g of CCl4 in 130.0 g of benzene? Pure benzene has a freezing point of 5.5°C and a Kf = 5.12 °C/m. Write your answer in Kelvin with 4 sig figs!
For benzene, C6H6, the freezing point constant is 5.12 °C/m and its normal freezing point is 5.5 °C. What is the freezing point of a solution containing 100.0 g of benzene and 20.0 g of napthalene (C10H8)?
The freezing point of benzene C6H6 is 5.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in benzene is testosterone . How many grams of testosterone, C19H28O2 (288.4 g/mol), must be dissolved in 243.0 grams of benzene to reduce the freezing point by 0.500°C ? Refer to the table for the necessary boiling or freezing point constant. Solvent Formula Kb (°C/m) Kf (°C/m) Water H2O 0.512 1.86 Ethanol CH3CH2OH 1.22 1.99 Chloroform CHCl3 3.67 Benzene C6H6 2.53 5.12 Diethyl ether...
The freezing point of pure benzene is 5.49 °C. The freezing point of a solution made using toluene in benzene is determined to be -13.0 °C. What is the molality of the toluene? (Kf benzene = 5.12 °C/m)