the heat of formation is the change in enthalpy accompanying the formation of a substance from its elements at 298 K and 1 a.t.m. pressure. Since the enthalpies of element are taken to be zero, the heat of formation of compounds

Options :
  1. is always negative
  2. is always positive
  3. may be negative or positive
  4. is zero
Answer and Explanation :-

Answer: Option 3

Explanation:

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