Determine the enthalpy of solution for a solid with δh values as described in each scenario.
Asked by maham237 @ in Chemistry viewed by 399 People
Asked by maham237 @ in Chemistry viewed by 399 People
Answered by maham237 @
Box 1, the value of ΔH solution is positive (endothermic)
Box 2 ΔH value = 0 and ,
Box 3 ΔH the value of ΔH solution is negative (exothermic)
Delta H reaction (ΔH) is the amount of heat change between the system and its environment
(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)
The enthalpy of solution formation depends on how much heat is released or absorbed during the dissolution process. So it can be negative (exothermic) or positive (endothermic)
When the solid is dissolved into the solution, 3 stages of the process will occur:
This enthalpy is endothermic, can be symbolized as ΔH1
If the enthalpy of stage 1 + 2 which is a bond-breaking enthalpy is greater than the enthalpy of stage 3 which is the bond-forming energy, the enthalpy of the solution will be endothermic (positive value,> 0), but vice versa if the enthalpy of stage 1 + 2 is smaller than the stage 3, the enthalpy of the solution will be exothermic (negative, <0)
And if stage 1 + 2, the enthalpy value is the same as stage 3, the enthalpy of the solution is 0, and it is said that this solution is ideal
From the above problem, we complete the picture that is asked according to the scenario
If we look at box 1, the value of ΔH of the solution will be positive because the enthalpy of the bond breaker is 3x greater than the enthalpy of the bond-forming, so the solution is endothermic
For box 2, the solution ΔH is 0 because the enthalpy values 1 + 2 and 3 are the same
As for box 3, ΔH solution will be negative (exothermic) because enthalpy 1 + 2 is less than 1/3 of enthalpy stage 3
an exothermic reaction
as endothermic or exothermic
an exothermic dissolving process
Keywords: exothermic, endothermic, enthalpy
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