An aqueous solution containing 17.5 g of an unknown molecular compound in 100.gwater was found to have a freezing point of -1.8°C. Calculate the molar mass of thisunknown compound. You can use the following steps to solve this problem. Showyour work.a. What is the freezing point change (AT) from pure water? The freezing point ofwater is 0.0°C.b. What is the freezing point depression constant (K₂) of water?c. What is the molality of the solution? (m=d. Solve the moles of the solute.moles of solutekg of solvente. Knowing the mass of the compound, and the moles of the compound, solve themolar mass of the compound.

Given,The mass of unknown molecular compound = 17.5 gThe mass of water = 100. gThe freezing point…

An aqueous solution containing 17.5 g of an unknown molecular compound in 100.g water was found to have a freezing point of -1.8°C. Calculate the molar mass of this unknown compound. You can use the following steps to solve this problem. Show your work. a. What is the freezing point change (ATA) from pure water? The freezing point of water is 0.0°C. b. What is the freezing point depression constant (K) of water? c. What is the molality of the solution? (m= d. Solve the moles of the solute. moles of solute kg of solvent e. Knowing the mass of the compound, and the moles of the compound, solve the molar mass of the compound.

An aqueous solution containing 17.5 g of an unknown molecular compound in 100.g water was found to have a freezing point of -1.8°C. Calculate the molar mass of this unknown compound. You can use the following steps to solve this problem. Show your work. a. What is the freezing point change (ATA) from pure water? The freezing point of water is 0.0°C. b. What is the freezing point depression constant (K) of water? c. What is the molality of the solution? (m= d. Solve the moles of the solute. moles of solute kg of solvent e. Knowing the mass of the compound, and the moles of the compound, solve the molar mass of the compound.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Related questions

Q: Addition of 4.50 g of an unknown substance in 95.00 mL CCl4 raises the boiling point by 0.80K.…

A: We know the relation between elevation of boiling point and Molality of non electrolytic solution :…

Q: When 634. mg of a certain molecular compound X are dissolved in 60. g of cyclohexane (C,H,2), the…

Q: The Kf and Kb values for water are 1.86 and 0.52°C/m, respectively. A solution boils at 107.5°C. At…

A: First calculate the molality of the solution using the boiling point of the solution. Use that…

Q: 15.A solution was made by dissolving 10.00 g of an unknown nonelectrolyte compound in 105.0 g of…

A: In given question ∆Tf= Kf×m formula used

Q: Calculate molecular weight of Naphthalene in g/mol

Q: Based on the information I was able to solve and provide, may I get help on #25 (Compare the actual…

A: We will use the adjusted temperature based on the thermometer calibration as the actual freezing…

Q: A student dissolves 0.180g of an unknown molecular solid in 50.0g of water and finds the freezing…

A: We will have to use the formula: ΔTf = i*m*Kf m = molality of solution mass of solvent = 50 g…

Q: When 426. mg of a certain molecular compound X are dissolved in 30. g of benzene (C6H6), the…

Q: Why is it important for us to leave the water for 5 minutes and determine the water's temperature?…

A: We are to discuss why we need to wait for 5 minutes before measuring the temperature of water. We…

Q: 6. Write True or False and explain your answer. CHCI-Acetone system is an ideal solution.X b. a. The…

A: Exothermic reactions can be defined as the reactions wich involve release of heat energy during…

Q: (a) Using the data from the table, determine the molality of the deicer solution. molality = m…

A: Given mass of CaCl2 = 9.57 g Volume of water = 58.6 mL = 58.6 g Convert grams to kg using…

Q: 240 220 200 NACIO3 180 KNO 160 140 KBrt 120 100 80 60 NaCl 40 20 20 40 60 100 120 Temperature (°C)…

Q: Consider a solution where 0.454 g of solute was dissolved into 11.2g of solvent. If the freezing…

Q: What is the freezing point of a solution made

A: Given Kf = 4.23c°/m Mass of solvent = 1kg Mass of solute = 14.79 I = 2 (KI is added, it will…

Q: 3. Dissolving 1.10 g of an unknown compound in 75.22 g of benzene reduces its freezing point from…

A: As we know, Depression in freezing point, ∆Tf is equal to ∆Tf = Tf° - Tf = i * Kf * mWhereTf°…

Q: What is the concentration of Ag* in a saturated Ag3(PO4) in water at 298 K? type your answer. x 10*…

Q: 2. Salt-in effect implies that solubility: a. Remains constant with increase in ionic strength b.…

Q: What is the solubility, in mol/ L, of AB2 in pure water? Ksp = 10.52 x 10-8 for AB2 Report your…

Q: Select the solute that will cause the largest freezing-point depression when dissolved in water. a.…

A: The depression in the freezing point is caused when a non-volatile solute is added to the solution.…

Q: As you increase elevation the atmospheric pressure decreases, which means the boiling point of water…

A: Boiling point of pure water = 95.0oCRequired Boiling point of water = 100.0oCMass of water = 1.0…

Q: A CHM 126 student followed a modified procedure similar to the one described in the "Determination…

A: Given Mass of the solvent, freezing point of pure solvent and solution, freezing point depression…

Q: 30. Which of the following organic compounds is the least soluble in water? A. H,CH,COCH,CH, B.…

Q: Here you have 0.30 mole of benzene and 0.70 mole of methylbenzene at 25 °C. a. The following shows…

A: Change in graph on addition of impurity.

Q: 1. The figure depicts the steps that contribute to the enthalpy change for the dissolution of NaCl.…

Q: 1. Using the freezing point of the solutions and the freezing point of the pure solvent, calculate…

A: To determine the molar mass of the solute for the run 2-5 in part A and calculate the percentage…

Q: -1 A certain liquid X has a normal freezing point of 5.40 °C and a freezing point depression…

A: Formula used :- ∆Tf = Kf m Where ∆Tf = change in freezing point = T0 f - Tf Where T0 f =…

Q: A certain substance X has a normal freezing point of-8.4 °C and a molal freezing point depression…

Q: The solubility of X2 gas in water is 0.620 g/L when a pressure of X2 over the solution is 11.2 atm.…

A: Given: Solubility of gas = 0.620 g/L. And partial pressure of gas = 11.2 atm.

Q: 1. A 0.194 g sample of a nonvolatile solute dissolves in 9.82 g of cyclohexane. The change in…

Q: A student prepared a sugar solution containing 1.4382 g of sugar (C12H22011, 342.29 g/mol) in 5.00…

A: Depression in freezing point (∆Tf) = Kf x m where, Kf = cryoscopic constant m = molality

Q: Which experimentally measured parameter will help you to decide whether solubility increases or…

A: Solubility: It is defined as the maximum amount of solute that can dissolve in a known quantity of…

Q: Match the letters on the image with what they represent. TEMPERATURE- D B F QG Freezing point…

A: The answer is as follows:

Q: 60. What is Henry's Law? Give an equation and define all terms, including units. When is it…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: What is the freezing point of a solution made by adding 8.93 g bohium flagide to 1 kg of solvent?…

A: Given: The mass of bohium flagide is 8.93 g. The mass of solvent is 1 kg. The freezing point of…

Q: 16. Determine the cahnge in boiling point for 397.7 g of carbon disulfide (Kb= 2.34 degrees Celsius…

A: We have to calculate the change in boiling point.

Q: Anthraquinone contains 80.8 % carbon, 3.8 % hydrogen and 15.4 %oxygen. The freezing point of camphor…

A: Empirical formula is way of representing a chemical compound which have element present in the…

Q: As you increase elevation the atmospheric pressure decreases, which means the boiling point of water…

Q: 1. A 0.194 g sample of a nonvolatile solute dissolves in 9.82 g of cyclohexane. The change in…

Q: 1. Determine the freezing point of a solution if 405 g AICI3 was dissolved in 1600g water. The k for…

Q: Question is attached

A: The freezing point depression for non-electrolyte solute can be calculated by the formula: ∆Tf =…

Q: When 170. mg of a certain molecular compound X are dissolved in 50. g of benzene (CH), the freezing…

A: Given- Weight of X = 170 mg = 0.170 g (1 g = 1000 mg) Weight of benzene = 50 gm = 0.050 Kg (1Kg…

Q: Use Henry's law to determine the molar solubility of helium at a pressure of 2.0 atm and 25°C.…

A: Given, Partial pressure of Helium gas (PHe) = 2.0 atm Henry's law constant for helium gas (k) = 3.70…

Q: Name Time M T W R F The freezing point of pure benzene (CH,) is 5.50°C. The freezing point of a…

A: Given information:Freezing point of solution (Tf) = 5.07 °CFreezing point of pure benzene (Tfo) =…

Q: 27. Find the freezing point of a solution of 990 g of CH3OH in 2.5 kg of water. Use the water…

Concept explainers

Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.

Question

An aqueous solution containing 17.5 g of an unknown molecular compound in 100.g
water was found to have a freezing point of -1.8°C. Calculate the molar mass of this
unknown compound. You can use the following steps to solve this problem. Show
your work.
a. What is the freezing point change (AT) from pure water? The freezing point of
water is 0.0°C.
b. What is the freezing point depression constant (K₂) of water?
c. What is the molality of the solution? (m=
d. Solve the moles of the solute.
moles of solute
kg of solvent
e. Knowing the mass of the compound, and the moles of the compound, solve the
molar mass of the compound.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1: Determine the molar mass of unknown molecular compound from the given data:

VIEW

Step 2: (a) Calculation for freezing point change of pure water:

VIEW

Step 3: (b) The Kf of water is:

VIEW

Step 4: (c) Calculation for molality of the solution:

VIEW

Step 5: (d) Calculation for moles of unknown compound:

VIEW

Step 6: (e) Calculation for molar mass of the compound:

VIEW

Solution

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 7 steps with 6 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.

Similar questions

Using the Kf and Kb equations with electrolytes.
Please consider significant figures.
The solubility in hexane of organic compound O is measured and found to be 11.1 at 5. "C. Calculate the volume of a saturated solution of O in hexane that L would contain 26.0 g of O at this temperature. Be sure your answer has the correct unit symboi and 3 significant digits. 0 D.B H d DO G
The molal freezing point depression constant K, 1.95 °C-kg-mol of X, the solution freezes at 0.4 °C. Calculate the freezing point of pure X. Be sure your answer has the correct number of significant digits. 0rc X 1 for a certain substance X. When 17.0 g of urea a ((NH,),CO) are dissolved in 200. g
||| O STATES OF MATTER Using the Kf and Kb equations with electrolytes A certain liquid X has a normal freezing point of 3.50 °C and a freezing point depression constant K, -5.23 °C-kg-mol solution made of 39.g of zinc chloride (ZnCl₂) dissolved in 450. g of X. Round your answer to 1 significant digit. *c X ODD Calculate the freezing point of a
1. The freezing point datas of pure water and 150 grams of H20 that includes 10 g of sucrose (C12H22011) are given below. According to these datas, calculate the molecular weight of 10 g sucrose (C12H22011) dissolved in 150 g of H2O. a. Freezing point of pure water, Tf = 0 °C Freezing point of solution, Tf = -0. 34 °C Freezing point depression, ATf = ... (0- (-0.34)) = 0.34°C Molal freezing point depression of water, Kf = •.1.86°C kg/mol b. Molality of solution, m = . c. Molecular weight of solute, MWs = .. %3D 2. Find the theoretical molecular weight of solute in literature and calculate the percentage error in molecular weight. MWs, real = Error%=
Calculate the molal freezing point depression constant of Kf of X.
Calculate the solubility of CaF, in water at 25 °C. You'|l find K.n data in the ALEKS Data tab. 2 sp Round your answer to 2 significant digits. x10
Beaker A has 1.00 kg of water and 0.100 mol of glucose. Beaker B has 1.00 kg of water and 0.100 mol of CaCl2. Answer the questions below, using LT (for less than), GT (for greater than), EQ (for equal to), or MI (for more information required) in the blanks provided. Xkmnbcz5a. The vapor pressure of pure water ________ the vapor pressure of the solution in Beaker A.b. The boiling point of the solution in Beaker A ________ boiling point of the solution in Beaker B.c. The molarity of the solution in Beaker A ________ molarity of the solution in Beaker B.d. The freezing point of the solution in Beaker A ________ freezing point of the solution in Beaker B.e. The solubility of the solute in Beaker A ________ solubility of the solute in Beaker B.
Question 9 Why does a bottle of carbonated drink taste flat after it has been left open after a period of time? Answer using complete sentences. H. 三 BIUS X2 x? Vx Q 云 Enter your answer here. All
Find the freezing point of a solution of 990 g of CH3OH in 2.5 kg of water. Use the water f.p.–depression constant: Kb(H2O) = 1.86 °C/{mol(solute)/kg(solvent)} A) +123 °C B) +77 °C C) +23 °C D) –0.74 °C E) –23 °C
Circle the one best Which one of the following is not a colloid? a. aerosol b. solvent c. emulsion "A solution not in equilibrium with respect to a given dissolved substance and in which more of the substance can ssolve" is known as what type of solution? a. unsaturated b. saturated loc. supersaturated Which one of the following is not a stable common ion? b. Bi³+ c. Sr2+ a. C12- d. p3- Which one of the following has the second highest boiling point? a. H₂Te b. H₂O c. H₂Se d. H₂S What is another name for a "lone pair"? a. base pair What occurs at the triple point in a phase diagram? b. There are three different melting points available. a. There are three different boiling points available. c. All phases are in equilibrium. udzianwollet end. A supercritical fluid has formed. "A measure of the ability of an atom in a molecule to draw bonding electrons to itself" is the definition of what? a. electronegativity b. totality c. bond order d. polarity b. nonbonding pair Which one of these…