A certain substance X has a normal boiling point of 98.8 °C and a molal boiling point elevation constant K, =0.73 °C-kg-mol. A solution is prepared by dissolving some urea ((NH,) CO) in 500. g of X. This solution boils at 99.8 °C. Calculate the mass of urea that was dissolved. Round your answer to 2 significant digits.

A certain substance X has a normal boiling point of 98.8 °C and a molal boiling point elevation constant K, =0.73 °C-kg-mol. A solution is prepared by dissolving some urea ((NH,) CO) in 500. g of X. This solution boils at 99.8 °C. Calculate the mass of urea that was dissolved. Round your answer to 2 significant digits.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter7: Statistical Data Treatment And Evaluation

Section: Chapter Questions

Problem 7.16QAP

See similar textbooks

Similar questions

1. What is the molarity of glucose (mol wt =180) in a solution containing 6.70g of glucose and 150 g of water? The final solution has a specific gravity of 1.015. Round off to 4 decimal places. 2. What is the osmolality of 12.5% by weight solution of AlCl (MW=133 g/mole)? 3. What is the normality (N) by w/v solution of CaCl containing 5 g of CaCl and 105g of water (CaCl MW=111 g/mole)? The specific gravity of the final solution is 1.35.
An aqueous solution contains 0.15g of an unknown solute and 50.0 g H2O. lt freezes at -0.050 °C, Find the (a) molecular weight of the solute and (b) boiling point of the solution. COMPUTE USING 3 SIGNIFICANT FIGURES FOR EACH STEP AND FOR THE FINAL ANSWER
Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. The osmotic pressures required for this process can be as high as 19.6 atm . What would the molar concentration of the tree sap have to be to achieve this pressure on a day when the temperature is 31 ∘C ? Express your answer to three significant figures and include the appropriate units.
When 1 mole of water is added to an infinitely large amount of an aqueous methanol solution having a mole fraction of methanol of .40, the volume of the solution increased by 17.35cm^3 and 25C. When 1 mole of methanol is added to such a solution, the volume increases by 39.01 cm^3. Calculate the volume of a solution containing .40 mole of methanol and .60 mole of water. What is the volume of .6 mole of water plus the volume of .4 mole of methanol before they are mixed? The densities of water and methanol at 25C are .998g/cm^3 and .791g/cm^3 respectivley.
Bristol Community College Fall River, Massachusetts Experiment 6: Molar Mass of a Molecular Solid from Freezing Point-Depression Measurement Name: __________________________________ Date: _______________ Approved: ___________ DATA SHEET Mass of lauric acid (in Part II) Mass of benzoic acid (in Part II) Freezing temperature of pure lauric acid (from Part I) data from Video 2 of Part I Freezing temperature of solution (from Part II) data from Video referenced in Part II Freezing point depression, Tf ( = Tf, lauric acid – Tf, solution) Molality (m) of solution ( Eq. 1) Moles of benzoic acid ( Eq. 2) Experimental molar mass of benzoic acid (Eq. 3) Calculate the molar mass of benzoic acid, C6H5COOH. Percent error Summary Questions A student determines…
The normal boiling point of a certain liquid X is 110.00°C, but when 26.1g of iron(III) nitrate (FeNO33) are dissolved in 450.g of X the solution boils at 110.5°C instead. Use this information to calculate the molal boiling point elevation constant Kb of X.Round your answer to 1 significant digit. =Kb⋅°Ckgmol
An experimental attempt was to convert 2000 cm^3 of a solution consists of 0.96 ethanol into another solution consisting of 0.56 ethanol. If the density of water at the experiment's temperature and pressure is 997 kg/ m^3, How much H2O should be added to the 2000 cm^3 solution? What is the solution's volume after conversion? Given data: In the 0.96 ethanol solution :V ethanol = 0.816 cm^3/g and Vwater = 1.273 cm/g In the 0.58 ethanol solution: V ethanol = 0.953 cm^3/g and :V water = 1.243 cm/g
A. Compute for the concentration of sulfuric acid in normality if you dissolve 23.76g of it to 255ml of water (express answer as a whole number) B. What is the equivalent molarity of the solution? (express answer as a whole number) Answers are not: A. 2 B. 1 A. 1 B. 1 A. 2 B. 2
In the determination of molar mass of an unknown substance by ebullioscopic constant, 30 mL of acetone (C3H6O) was placed in a test tube with thermometer and glass tubing and subjected to water bath. Upon boiling, the temperature reads 56 deg C. For the boiling point of unknown-acetone solution, you prepared the solution by mixing 1.60 g of unknown solute in the 30 mL acetone and subjected it again to water bath. The boiling temperature of the solution is 56.68 deg C. The density of acetone = 0.9849 g/mL and the Kb of acetone = 1.67 degC/kg
In the determination of molar mass of an unknown substance by ebullioscopic constant, 30 mL of acetone (C3H6O) was placed in a test tube with thermometer and glass tubing and subjected to water bath. Upon boiling, the temperature reads 56 deg C. For the boiling point of unknown-acetone solution, you prepared the solution by mixing 1.60 g of unknown solute in the 30 mL acetone and subjected it again to water bath. The boiling temperature of the solution is 56.68 deg C. The density of acetone = 0.9849 g/mL and the Kb of acetone = 1.67 degC/kg What is the value for delta Tb or the change in boiling temperature (in degrees Celsius)?
In the determination of molar mass of an unknown substance by ebullioscopic constant, 30 mL of acetone (C3H6O) was placed in a test tube with thermometer and glass tubing and subjected to water bath. Upon boiling, the temperature reads 56 deg C. For the boiling point of unknown-acetone solution, you prepared the solution by mixing 1.60 g of unknown solute in the 30 mL acetone and subjected it again to water bath. The boiling temperature of the solution is 56.68 deg C. The density of acetone = 0.9849 g/mL and the Kb of acetone = 1.67 degC/kg What is the value for delta Tb or the change in boiling temperature (in degrees Celsius)? Final answer must be rounded off to 2 decimal places, and shall NOT have any unit.
In the determination of molar mass of an unknown substance by ebullioscopic constant, 30 mL of acetone (C3H6O) was placed in a test tube with thermometer and glass tubing and subjected to water bath. Upon boiling, the temperature reads 56 deg C. For the boiling point of unknown-acetone solution, you prepared the solution by mixing 1.60 g of unknown solute in the 30 mL acetone and subjected it again to water bath. The boiling temperature of the solution is 56.68 deg C. The density of acetone = 0.9849 g/mL and the Kb of acetone = 1.67 degC/kg - What is the value for delta Tb or the change in boiling temperature (in degrees Celsius)? Final answer must be rounded off to 2 decimal places, and shall NOT have any unit. - How many moles of solute is present in the solution given in the video? Final answer must be rounded off to 2 decimal places, and shall NOT have any units. - What is the molal concentration of the solution? Final answer must be rounded off to 2 decimal places, and shall NOT…