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What is ‘Df (delta f) :

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What is ‘Df (delta f) :

(a) Standard heat of reaction

(b) Standard heat of product

(c) Standard heat of combustion

(d) Standard heat of formation

I have been asked this question in an internship interview.

My doubt stems from Equilibrium Constants and Conversions topic in chapter Applications of Thermodynamic in Unit Processes of Unit Processes

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Correct option is (d) Standard heat of formation

For explanation I would say: The amount of energy required to form the element is ‘Df’ called as Standard heat of formation.

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