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Why standard entropy of an elementary substance is not zero whereas standard enthalpy of formation is taken as zero?

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asked Oct 6, 2017 in Chemistry by jisu zahaan (28,760 points) ● 26 ● 374 ● 811

Why standard entropy of an elementary substance is not zero whereas standard enthalpy of formation is taken as zero? 

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answered Oct 6, 2017 by sforrest072 (157,439 points) ● 61 ● 410 ● 939
selected Oct 6, 2017 by sanjeev
 
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Entropy is zero only at absolute zero. Enthalpy of formation is the heat change involved in the formation of one mole of the substance from its elements. An element formed from itself means no heat change, i.e. ΔfH0 = 0.

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