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Q.

Calculate the EA of O atom to O2- ion from the following data:i. ΔfH⊖[MgO(s)]=−600 kJ mol−1ii. ΔuH⊖[MgO(s)]=−3860 kJ mol−1iii. IE1+IE2 of Mg(g)=2170 kJ mol−1iv. Δdiss H⊖O2(g)=+494 kJ mol−1v. ΔsubH⊖ of Mg(s)=+150 kJ mol−1

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a

+693 kJ mol−1

b

−693 kJ mol−1

c

+69.3 kJ mol−1

d

−69.3 kJ mol−1

answer is A.

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Detailed Solution

Using Born-Haber cycle for MgO, calculation of EA of O atom ot O2- ion (All values in kJ mol-1)∴ΔfH⊖=ΔsubH⊖+IE1+IE2+12Δdiss+EA1+EA2+ΔUH⊖ −600=150+2170+12×494+EA1+EA2−3860∴EA1+EA2=+693 kJ mol−1
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