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1. What is meant by enthalpy of formation?

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1. What is meant by enthalpy of formation? 

2. What is the value of standard enthalpy of formation (∆f H) of an element?

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1. Enthalpy of formation is the enthalpy change when one mole of a compound is formed from its elements in their most stable states of aggregation (i.e., reference state). 

2. Zero

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