The standard heat of formation, in kcal / mol ^ of Ba ²⁺ is : [Given : standard heat of formation of SO ₄²⁻ ion (aq) =-216 kcal / mol , Standard heat of crystallisation of BaSO ₄( ~s )=-4.5 kcal / mol , standard heat of formation of . BaSO

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The standard heat of formation, in kcal / mol ^ of Ba ²⁺ is : [Given : standard heat of formation of SO ₄²⁻ ion (aq) =-216 kcal / mol , Standard heat of crystallisation of BaSO ₄( ~s )=-4.5 kcal / mol , standard heat of formation of . BaSO ₄( ~s )=-349 kcal / mol ]

Quantrex Academy · Accepted Answer

Correct answer: A. -128.5

aligned & H _ crys ( BaSO ₄ )= H _ f ( BaSO ₄ )- [ H _ f ( Ba ⁺² )+ H _ f ( SO ₄⁻² ) ] & -4.5=[-349]- [ H _ f ( Ba ⁺² )+(-216) ] & H _ f ( Ba ⁺² )=-128.5 kCal ~mol ⁻¹ aligned

The standard heat of formation, in kcal / mol ^ of Ba ²⁺ is : [Given : standard heat of formation of SO ₄²⁻ ion (aq) =-216 kcal / mol , Standard heat of crystallisation of BaSO ₄( ~s )=-4.5 kcal / mol , standard heat of formation of . BaSO ₄( ~s )=-349 kcal / mol ]

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