Please answer the question pertaining to the Calorimetry - Heat of Solution Expe

Question

Please answer the question pertaining to the Calorimetry - Heat of Solution Experiment posted below: When the Trial 1 and Trial 2 results determined from measuring the heat of solution of CaCl2 are compared to the results of a second experiment which are posted in the Chemistry Lab II manual, I determined a percent difference of -44.5 %. Give one specific source of error that could account for the observed percent difference.

Experiment 3 Data Sheet CHEM 0220- Section Calorimetry - Heat of Solution NOTE: SHOW ALL OF YOUR CALCULATIONS ON ANOTHER SHEET OF PAPER Part A. Heat of Solution of CaCl2 DATA Mass of calorimeter cup water Mass of calorimeter cup empty Mass of beaker +solid Mass of beaker (after transfer of solid) Water temperature before adding solid Water temperature after adding solid Did all of the CaCl2 dissolve (Y/N)? RESULTS OF CALCULATIONS Mass of water Mass of solid solute transferred Total mass of solution Temperature change for solution Heat change for the liquid in the calorimeter Heat change for the dissolution process Molar heat of solution of CaCl2 (kJ/mol) Average molar heat of solution of CaCl2 Accepted value Percent difference If your percent difference is greater than 5%, give one specific source of error that could account for the Name Lecture Instructor Approved Trial 1 15.455 32,005 4e,47 1.7V4 Trial 2 1,664 0 43.8 3.085 .3 1454, 230 -q. 3 ks/mul 1986, no -vs,71J 4le. 0 ! observed percent difference: 41

Explanation / Answer

water which you added before solid in trial 1 and trial 2 is the viable for your calculated difference.

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