Colligative Property Lab

Please help me with Kf and deltaTf calculations for a pure solvent, a solvent with various amounts of ethyl acetate and an unknown solvent (need molar mass of this). Lab results for freezing/melting point (f/m pt) of pure cyclohexane: 25 mL cyclohexane, All three trials yielded 8.0 degrees. Lab results for freezing/melting point of cyclohexane with varying amounts of solvent ethyl acetate: Added .20 mL of Ethyl acetate to 25 mL cyclohexane, Trial #1, 4 degrees, Trial #2, 5 degrees, Trial#3, 5 degrees Added .40 mL of Ethyl acetate to 25 mL cyclohexane, Trial #1, 2 degrees, Trial #2, 3 degrees, Trial#3, 2 degrees Added .60 mL of Ethyl acetate to 25 mL cyclohexane, Trial #1... click for more

COLLIGATIVE PROPERTIES

1. I need help with the standard deviation/percentage error in the attached lab experiment. 2. Also need help graphing for the ethyl acelate and unknown solvent -- plotting negative delta T versus the total volume of solute that was added (2 graphs) and calculation of the slopes 3. I am not certain but I believe this question relates to the accepted value of the freezing point of cyclohexane 6.5 degrees and a Kf of 20.0 (not the 8.0 degrees that was found in the lab). Can an answer to the following question be determined using this assumption? Relationship of freezing point depression constant to its enthalpy of fusion and its entropy of fusion with the following formulas delta H... click for more

Thermodynamics - Chemistry 1

(See attached file for full problem description with proper symbols.) --- 1. Citric acid is a triprotic acid (represented by H3Cit). A student mixes together the following solutions in a styrofoam coffee cup: • 5.00 mL of 0.64 M citric acid • 45.00 mL of 0.77 M NaOH The two solutions start at a temperature of 26.0°C, and reach a final temperature of 27.9°C. The final, combined mixture has a mass of 51.6 grams and a specific heat of 4.0 J/g°C. Assume that no heat is transferred to the cup or surroundings. d) Calculate the enthalpy of reaction (H) for this reaction in kJ/mol. Is the reaction exothermic or endothermic?

Thermodynamics - Chemistry 1

(See attached file for full problem description with proper symbols) --- 3. You mix together the following solutions in a coffee-cup calorimeter: 100.0 mL of 0.200 M CsOH 50.0 mL of 0.400 M HCl Both solutions start out at 22.50°C, and the final temperature after reaction is 24.28°C. The densities of the solutions are all 1.00 g/mL, and the specific heat of the mixture is 4.2 J/g°C. Calculate the enthalpy change (H) for this reaction in kJ/mol. ---

Coordination chemistry problems

Attached are the problems, and 3 pages of the answers I have obtained, I have worked them out as complete as possibe showing how I attained my answer. I would like detailed solution on how to correctly solve any that I may have gotten wrong, so that I can learn how to solve inorganic problems properly.