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Thermochemical Cycles?
Set up a thermochemical cycle for determining the standard enthalpy of hydration of M2+ ions using the following data.
In the class immediately following the due date, submit, in writing, a diagram of this cycle showing all steps clearly labelled with the appropriate energy terms and values.
(MX2 is a solid. The standard states of elements M and X are M(s) and X2(g) respectively).
ΔH°sub of M(s)172.9 kJ/mol
The first ionization energy of M5.043 eV
The second ionization energy of M10.389 eV
The bond dissociation enthalpy of X2203.9 kJ/mol
The electron affinity of X(g)3.36 eV
ΔH°sol of MX2(s)-155.0 kJ/mol
ΔH°hyd of X--413.2 kJ/mol
ΔH°f of MX2-763.90 kJ/mol
Calculate ΔH°hyd of M2+.
_____molar dHhyd for most common M+2 ions ranges from -1305kJ/mole Ba+2 to -2105kJ/mole Ni+2
This site gives thermocycl of MgSO4(c) ----------> Mg+2 (hyd) + SO4= (hyd):
https://kb.osu.edu/dspace/bitstream/1811/5381/1/V68N02_123.pdf
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