How do I calculate the kf for cyclohexane (pure solvent)? Also how to calculate the mass...
How do I calculate the kf for cyclohexane (pure solvent)?
Also how to calculate the mass of cyclohexane in the solution (kg)?
Please let me know which information is needed in order to solve for this.
Homework Answers
Molar Mass by Freezing Point Depression:
FREEZING POINT DEPRESSION:
The introduction of a solute to a solvent will decrease the freezing point (temperature) of the solvent.
Thus, ∆ Tf α m
so, ∆ Tf = Kf Xm where Kf is the freezing point depression constant
for cyclohexane, the freezing point is 6.5 °C and Kf value 20.1°C.kg/mole.
The equation needed:
M2=KfX(W2/ ∆ TfXW1)
M2 = molar mass of solute.
Add Answer to:
How do I calculate the kf for cyclohexane (pure
solvent)?
Also how to calculate the mass...
Molar Mass of a Solute The freezing point of cyclohexane is 6.50°C. For cyclohexane solvent Kf=20.0....
Molar Mass of a Solute The freezing point of cyclohexane is 6.50°C. For cyclohexane solvent Kf=20.0. 0.147 g of an unknown solute is dissolved in 7.71 g of cyclohexane (C6H12). The freezing point of the solution was 3.38°C. Calculate the corresponding molar mass of the solute. g/mol 1homework pts Submit Answer Tries 0/5 To the above solution a further 0.139 g of the unknown is dissolved. The freezing point of the resulting solution was 0.85°C. Calculate the corresponding molar mass...
1h. A certain pure solvent freezes at 39.8°C and has a freezing point depression constant Kf...
1h. A certain pure solvent freezes at 39.8°C and has a freezing point depression constant Kf = 0.777°C/m. What is the predicted freezing point (in °C) of a solution made from this solvent that is (1.90x10^0) m in a non-electrolyte solute? 1i. When (8.23x10^1) g of a non-electrolyte is dissolved in (5.2600x10^2) g of a solvent (with Kb = 0.416°C/m) the boiling point of the solution is 1.50°C higher than the boiling point of the pure solvent. What is the...
Data Table 3 RUN #1 RUN #2 RUN #3 Volume of used cyclohexane solvent, Vocoleane, ml...
Data Table 3 RUN #1 RUN #2 RUN #3 Volume of used cyclohexane solvent, Vocoleane, ml 5mL 5 mL 5 mL Cyclohexane density deyclobesan 0.799 g/cm Mass of used cyclohexane solvent, (kg) 1c.11 0.012k 0-012 0-012V Freezing point depression constant, K, for cyclohexane, KF ('C. kg/mol) 20.0 The value of m-(ATF /KF), (mol/kg) for the solution of unknown in clohexane Number of moles of unknown in the sample -0.00S 0.005 7.2 x 10 xIO S - x 10-5 Mass of...
a. (2) On Graph 1, extrapolate and give the freezing point of the pure solvent to...
a. (2) On Graph 1, extrapolate and give the freezing point of the pure solvent to the nearest 0.1°C. Show the extrapolation on graph 1. b. (2) On Graph 2, extrapolate and give the freezing point of the solution to the nearest 0.1 °C. Show the extrapolation on graph 2. c. Determine the change in freezing point (AT) between pure solvent and solution? (3) d. (7) If the molal freezing point depression constant (KI) for the solvent is 1.86 kg°C/mol,...
Calculate the molar mass of the unknown acid A student knows or gathered the following information:...
Calculate the molar mass of the unknown acid A student knows or gathered the following information: Kf = 5.12 °C/m Tf (pure) = 35.7 °C Tf (solution) = 44.4 °C mass of solvent = 5.007 g mass of unknown acid = 1.006 g ΔTf = m * Kf Answer:________?
Hi, I need some help with Chemistry. Q1: Q2: Here is some background for the questions: Thank y...
Hi, I need some help with Chemistry.
Q1:
Q2:
Here is some background for the questions:
Thank you in advance.
You add 0.0336 moles of benzoic acid solute to 16.00 g of an unknown solvent, which lowers the freezing point of the solvent by 8.6 °C. Calculate the freezing point depression constant (Kf) of the unknown solvent. You dissolve 1.00 g sample of an unknown solute is in 8.00 g of lauric acid, which lowers the freezing point by 5.0...
An aqueous CaCl2 solution has a vapor pressure of 80.2 mmHg at 50 ∘C. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass percent? A hypotheti...
An aqueous CaCl2 solution has a vapor pressure of 80.2 mmHg at 50 ∘C. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass percent? A hypothetical solution forms between a solid and a liquid. The values of the thermodynamic quantities involved in the process are shown in the following table. Action Enthalpy separation of solute 11.5 kJ/mol separation of solvent 21.8 kJ/mol formation of solute-solvent interactions -86.7 kJ/mol solute...
how do i calculate yield % and pure yield %?? I know i have to balance...
how do i calculate yield % and pure yield %??
I know i have to balance an equation first but C7H8O-> C7H6O
does not make sense to me...
I believe benzyl alcohol is the limiting reagent
>N TEMPO O. CH2Cl2 KBr, NaOCI NaHCO3, H20 CyH2O Mol. Wt.: 108.14 I wo bp: 205°C V CyH60 Mol. Wt.: 106.12 bp: 178°C Crude data Student Data: Purified data (Silica Gel Column - see protocol for conditions) Pure mass: Not collected Pure yield: %...
Work on how to calculate molecular formula for percentages. Also how to calculate the degree of...
Work on how to calculate molecular formula for percentages.
Also how to calculate the degree of unsaturatuon.
From the MS, IR, 'H-NMR, and "C-NMR provided, please identify the organic compound. Because you are able to take this home, you must now solve the structure and label each IR H-NMR, and "C-NMR unambiguously. If you need a review, I have already posted spectroscopy materials from CHM235. Please utilize those handouts and let me know if you have any questions regarding the...
I need this quick please 27. A pure solvent freezes at 43.4°C. The freezing temperature is...
I
need this quick please
27. A pure solvent freezes at 43.4°C. The freezing temperature is 40.7°C when 52.5 g of CO(NH-h is in 1.00 x 102 g of the solvent. Calculate the molal freezing point constant of the solvent. (The molar mass for CO(NH2h is 60.06 g/mol.) a. 0.309 °C/m b. 0.343°C/m c. 0.93°C/m d. 13.9°C/m e. 14.9°C/m 28. K-1.3 x 10-10 for the reaction HC,H,O(a)H (aq) + C,H,O (aq). In which direction is the equilibrium favored? a. Forward...
Molar Mass of a Solute The freezing point of cyclohexane is 6.50°C. For cyclohexane solvent Kf=20.0. 0.147 g of an unknown solute is dissolved in 7.71 g of cyclohexane (C6H12). The freezing point of the solution was 3.38°C. Calculate the corresponding molar mass of the solute. g/mol 1homework pts Submit Answer Tries 0/5 To the above solution a further 0.139 g of the unknown is dissolved. The freezing point of the resulting solution was 0.85°C. Calculate the corresponding molar mass...
Data Table 3 RUN #1 RUN #2 RUN #3 Volume of used cyclohexane solvent, Vocoleane, ml 5mL 5 mL 5 mL Cyclohexane density deyclobesan 0.799 g/cm Mass of used cyclohexane solvent, (kg) 1c.11 0.012k 0-012 0-012V Freezing point depression constant, K, for cyclohexane, KF ('C. kg/mol) 20.0 The value of m-(ATF /KF), (mol/kg) for the solution of unknown in clohexane Number of moles of unknown in the sample -0.00S 0.005 7.2 x 10 xIO S - x 10-5 Mass of...
a. (2) On Graph 1, extrapolate and give the freezing point of the pure solvent to the nearest 0.1°C. Show the extrapolation on graph 1. b. (2) On Graph 2, extrapolate and give the freezing point of the solution to the nearest 0.1 °C. Show the extrapolation on graph 2. c. Determine the change in freezing point (AT) between pure solvent and solution? (3) d. (7) If the molal freezing point depression constant (KI) for the solvent is 1.86 kg°C/mol,...
Hi, I need some help with Chemistry.
Q1:
Q2:
Here is some background for the questions:
Thank you in advance.
You add 0.0336 moles of benzoic acid solute to 16.00 g of an unknown solvent, which lowers the freezing point of the solvent by 8.6 °C. Calculate the freezing point depression constant (Kf) of the unknown solvent. You dissolve 1.00 g sample of an unknown solute is in 8.00 g of lauric acid, which lowers the freezing point by 5.0...
how do i calculate yield % and pure yield %??
I know i have to balance an equation first but C7H8O-> C7H6O
does not make sense to me...
I believe benzyl alcohol is the limiting reagent
>N TEMPO O. CH2Cl2 KBr, NaOCI NaHCO3, H20 CyH2O Mol. Wt.: 108.14 I wo bp: 205°C V CyH60 Mol. Wt.: 106.12 bp: 178°C Crude data Student Data: Purified data (Silica Gel Column - see protocol for conditions) Pure mass: Not collected Pure yield: %...
Work on how to calculate molecular formula for percentages.
Also how to calculate the degree of unsaturatuon.
From the MS, IR, 'H-NMR, and "C-NMR provided, please identify the organic compound. Because you are able to take this home, you must now solve the structure and label each IR H-NMR, and "C-NMR unambiguously. If you need a review, I have already posted spectroscopy materials from CHM235. Please utilize those handouts and let me know if you have any questions regarding the...
I
need this quick please
27. A pure solvent freezes at 43.4°C. The freezing temperature is 40.7°C when 52.5 g of CO(NH-h is in 1.00 x 102 g of the solvent. Calculate the molal freezing point constant of the solvent. (The molar mass for CO(NH2h is 60.06 g/mol.) a. 0.309 °C/m b. 0.343°C/m c. 0.93°C/m d. 13.9°C/m e. 14.9°C/m 28. K-1.3 x 10-10 for the reaction HC,H,O(a)H (aq) + C,H,O (aq). In which direction is the equilibrium favored? a. Forward...
Most questions answered within 3 hours.
-
Explain the principle of DC converter operation with (a)
resistive and (b) RL load using appropriate...
asked 46 seconds from now -
Bob is moving away from Alice with speed of 0.5c. Carlos is
moving away from Alice...
asked 3 seconds from now -
All of the following statements are true regarding the LIFO
reserve except:
Select one:
a. Companies...
asked 4 minutes ago -
Discuss the predicament that a safety professional faces knowing
that some OSHA regulations are outdated and...
asked 4 minutes ago -
Suppose the times (in hours) that it took for a tax preparer to
complete 15 randomly...
asked 5 minutes ago -
A 30-kg box is at rest on a horizontal floor with friction
coefficients μs = 0.65...
asked 7 minutes ago -
Erwin Schrödinger’s proposal regarding the
characteristics of electrons behavior, (What he meant
by wave like behavior...
asked 15 minutes ago -
Four years ago, your firm issued $1,000 par, 25-year bonds, with a
7 percent coupon rate...
asked 16 minutes ago -
A charity website collects donations for cancer
research. They are considering a sponsored post on Facebook...
asked 15 minutes ago -
Suppose you had an unknown solution which was either NaCl or
3NaNO, and you needed to...
asked 20 minutes ago -
why are the small particles in soil so important relative to the
large particles ?
what...
asked 25 minutes ago -
A 179.4-N bird feeder is supported by three cables as shown in
the figure below. Find...
asked 1 hour ago