40. Define the following:
(i) First law of thermodynamics.
(ii) Standard molar enthalpy of formation.
40. Define the following:
(i) First law of thermodynamics.
(ii) Standard molar enthalpy of formation.
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1 Answer
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40. (i) First law of thermodynamics: It states that energy can neither be created nor be destroyed. The energy of an isolated system is constant.
?u = q + w(ii) The standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation (also known as reference state is called Standard Molar Enthalpy of Formation. Its symbol is Δf H?, where the subscript ‘ f ’ indicates that one mole of the compound in question has been formed in its standard state from its elements in their most stable states of aggregation.
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