(193) Twitter Assignments E Masteringchemistry: Chapter × As you saw in Part B,
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(193) Twitter Assignments E Masteringchemistry: Chapter × As you saw in Part B, the vapo Alyami × ( Secure https://session.masteringchemistry.com/myct/itemView?assignmentProblemID=87546017 Chapter 13 Energetics of Solution Formation previous | 4 of 19 | next » Energetics of Solution Formation Correct A solution is formed when the solute uniformly disperses throughout (or dissolves in) the solvent. The process can be described though three steps: The dissolution of calcium chloride in water is very exothermic and is used in "hot compresses' to produce heat. When the inner plastic bag of the compress is broken, the calcium chloride dissolves in the water contained in the outer bag. The reaction is very exothermic and produces the desired warming effect. 1. separation of solvent-solvent particles, 2. breaking of solute-solute particles, and Part C 3. formation of solute-solvent interactions. The overall energy change for the solution process AHsoln, is the sum of the enthalpies of the three steps. Whether A Hpon is endothermic or exothermic depends on the relative magnitudes of H1, H2 , and H3 where the subscript indicates the step in the process corresponding to the enthalpy value. 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 separation of solute separation of solvent Enthalpy 11.5 kJ/mol 26.8 k.J/mol formation of solute-solvent interactions -84.7 kJ/mol solute Calculate the enthalpy of solution in kilojoules per mole of solute Enter your answer numerically in kilojoules per mole of solute Hints kJ/mol Submit My Answers Give Up Incorrect; Try Again; 5 attempts remaining ContinueExplanation / Answer
PART C:
Hsoln = sum of enthalpies of 3 steps
= 11.5 kJ/mol + 26.8 kJ/mol + (-84.7 kJ/mol)
= - 46.4 kJ/mol
Therefore,
Hsoln = - 46.4 kJ/mol
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