please help me fill the last 5 blanks please about the enthalpies and provide th
ID: 704512 • Letter: P
Question
please help me fill the last 5 blanks please about the enthalpies and provide the equation and steps if possible thanks so much.
Determination of AHe.of a cation Formula of salt sample Trial 1 Trial 2 Mass of salt Moles of salt: Mass of water Initial temperature of salt and water: Final temperature of salt and water: 233C 130C 233-253 s Heat flow of water (include correct sign) salt (include correct sign)0 3,9?45124-9324 32.1 Heat flow of salt (include correct sign) Enthalpy of solution for the salt: Enthalpy of formation of the salt (from lab manual);: Enthalpy of formation of the anion (from lab manual): 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 repor sheet. If calculations are done in your lab notebook, photocopies are acceptable. Note: Yo must write out the formation equations of all products and reactants and sum to find th change in enthalpy for the formation of the cation (like example 5.3). Failure to do so will resul in zero credit. 82Explanation / Answer
Enthalpy of Salt Solution:
?Hs = (?Hh2o + ?Hnacl) / n nacl
Sample 1:
?Hs = (223.3 + 3.9556512) / 0.08705 = 2610.6 J / mol
Sample 2:
?Hs = (235.4 + 4.32432) / 0.08564 = 2799.2 J / mol
NOTE: The enthalpies of formation of the salt and the anion are missing, these are not possible to see them in the images shown, therefore, a demonstration of the calculation of the last two values ??will be made.
For the reaction: NaCl = Na + + Cl-
?Hs = ?Hf Na + + ?Hf Cl- - ?Hf NaCl
the enthalpy of formation of the cation is cleared:
?Hf Na + = ?Hs + ?Hf NaCl - ?Hf Cl-
with this equation the enthalpy values ??of salt and anion formation (NaCl and Cl- respectively) are substituted for both samples.
Average enthalpy of cation formation:
?H Na + average = (?H Na + 1 + ?H Na + 2) / 2.
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