Determination of of a cation KCI Formula of salt sample: April a, aoi8 Trial 1 T

Question

Determination of of a cation KCI Formula of salt sample: April a, aoi8 Trial 1 Trial 2 5.05.0a Mass of salt: 91 Moles of salt: 0.010% molas 52.9942 520 Mass of water: aus.803-155.1 ais oig- 15.930 Initial temperature of salt and water: Final temperature of salt and water: -0401 -350- Heat flow of water (include correct sign): Heat flow of salt (include correct sign): Enthalpy of solution for the salt: Enthalpy of formation of the salt (from lab manual): Cnhy f fomatio a Enthalpy of formation of the cation: Average Enthalpy of formation of the cation On additional paper, clearly show an example of each calculation performed to fill in the report sheet. If calculations are done in your lab notebook, photocopies are acceptable. Note: You must write out the formation equations of all products and reactants and sum to find the change in enthalpy for the formation of the cation (like example 5.3), Failure to do so will result in zero credit. 82

Explanation / Answer

Salt = KCl

Trial 1

moles of Salt = 0.068 moles

heat flow H2O = -640 J

heat flow of salt = +640 J

Enthalpy of salt = 640/0.068 x 100 = 9.412 kJ/mol

Enthalpy of formation of cation and anion from manual = missing from above data

Enthalpy of cation = 9.412 kJ/mol

Enthalpy of anion = 9.412 kJ/mol

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