Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated...
Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. When 2.50 g thyroxine is dissolved in 55.0 g benzene, the freezing point of the solution is depressed by 0.300oC. What is the molar mass of thyroxine? (Kf for benzene is 5.12oC∙kg/mol.)
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Thyroxine, an important hormone that controls the rate of
metabolism in the body, can be isolated...
Problems-Mathematical Colligative Properties Thyroxine, an important hormone that controls the rate of metabolism in the body,...
Problems-Mathematical Colligative Properties Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution is 5.144C. Pure benzene freezes at 5.444°C and has a Krof 5.12°C/m. What is the molar mass of thyroxine? 21. 19, The reaction between nitric oxide and ozone produces nitrogen dioxide and oxygen gas. The activation energy for the...
7. The vapor pressure of water at 25.0°C is 23.8 torr. Determine the mass of glucose...
7. The vapor pressure of water at 25.0°C is 23.8 torr. Determine the mass of glucose (molar mass = 180 g/mol) needed to add to 500.0 g of water to change the vapor pressure to 23.3 torr. (20 points) Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution is found to...
When 12.6-grams of an unknown compound is placed in 0.116-kg of benzene, the freezing point is...
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...
A 2.50 g sample of naphthalene, C10H8, was dissolved in 100 g of benzene. What is...
A 2.50 g sample of naphthalene, C10H8, was dissolved in 100 g of benzene. What is the freezing point of the solution? The freezing point of pure benzene is 5.45 degrees Celsius; Kf=5.07 degrees Celsius/m. The molar mass of C10H8 is 128.17 g/mol The answer is supposed to be 4.46 degrees Celsius. How did they get there?
7. A solution is prepared by mixing 25 mL pentane (CsH12, d 0.63 g/mL) with 45...
7. A solution is prepared by mixing 25 mL pentane (CsH12, d 0.63 g/mL) with 45 mL hexane (CeHh4,d 0.66 g/mL). Assume that the volumes add on mixing, calculate the molality a. 0.217 m b. 0.25 m c. 13.4 m d. 7.3 m A chemist is trying to identify a human hormone that controls metabolism by determining its molar mass. A sample weighing 0.546 g was dissolved in 15.0 g benzene, and the freezing point depression was determined to be...
Calculate the freezing point of a solution of 40.0 g of calcium chloride (molar mass =...
Calculate the freezing point of a solution of 40.0 g of calcium chloride (molar mass = 110.98 g/mol), dissolved in 800. g of benzene, C6H6. Kf for benzene is 5.10oC/m and the freezing point is 5.50oC for benzene.
The molar mass of unknown molecular compound is determined using freezing point depression. The substance is...
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
A container containing 6.19 L of a gas is collected at 244 K and then allowed...
A container containing 6.19 L of a gas is collected at 244 K and then allowed to expand to 23.4 L. What must the new temperature be in order to maintain the same pressure? Express your answer in units of K. You do not need to enter the unit. When 16.8-grams of an unknown compound is placed in 0.176-kg of benzene, the freezing point is changed by 1.93oC. The value of Kf= 4.90oC/m for benzene. Determine the molar mass of the...
Question #2 -/1 points How many grams of calcium nitrate need to be dissolved in 75...
Question #2 -/1 points How many grams of calcium nitrate need to be dissolved in 75 mL of water to form a solution that has a freezing point of -3.2 deg C? grams of calcium nitrate Evaluate Question #3 -/1 points What is the freezing point in °C) of a solution of 8.0 g of carbon tetrachloride, CCl4, in 80.0 g of benzene, C6H6. For benzene, Tp = 5.5°C and Kf = 5.12 deg kg mole?? Freezing point of solution...
1) Adrenaline is the hormone that triggers the release of extra glucose molecules in times of...
1) Adrenaline is the hormone that triggers the release of extra glucose molecules in times of stress. A solution of 1.75g of adrenaline in 36g of CHCI3 depresses the solution freezing point by 1.25 °C. Calculate the molar mass (g/mol) of adrenaline. Kf CHCI3 = 4.68 °C/m. Please show work. ____________________________________________________________ 2) What is the boiling point (°C) of an aqueous 0.5 M Al(NO3)3 (MM = 212.996 g/mol) solution whose density is 1.005 g/mL at P = 1atm? Assume theoretical...
Problems-Mathematical Colligative Properties Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution is 5.144C. Pure benzene freezes at 5.444°C and has a Krof 5.12°C/m. What is the molar mass of thyroxine? 21. 19, The reaction between nitric oxide and ozone produces nitrogen dioxide and oxygen gas. The activation energy for the...
7. The vapor pressure of water at 25.0°C is 23.8 torr. Determine the mass of glucose (molar mass = 180 g/mol) needed to add to 500.0 g of water to change the vapor pressure to 23.3 torr. (20 points) Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution is found to...
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...
7. A solution is prepared by mixing 25 mL pentane (CsH12, d 0.63 g/mL) with 45 mL hexane (CeHh4,d 0.66 g/mL). Assume that the volumes add on mixing, calculate the molality a. 0.217 m b. 0.25 m c. 13.4 m d. 7.3 m A chemist is trying to identify a human hormone that controls metabolism by determining its molar mass. A sample weighing 0.546 g was dissolved in 15.0 g benzene, and the freezing point depression was determined to be...
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
Question #2 -/1 points How many grams of calcium nitrate need to be dissolved in 75 mL of water to form a solution that has a freezing point of -3.2 deg C? grams of calcium nitrate Evaluate Question #3 -/1 points What is the freezing point in °C) of a solution of 8.0 g of carbon tetrachloride, CCl4, in 80.0 g of benzene, C6H6. For benzene, Tp = 5.5°C and Kf = 5.12 deg kg mole?? Freezing point of solution...
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