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Define standard enthalpy of formation....

Define standard enthalpy of formation.

A

Formation of 1 mol. Of a substance at BTP.

B

Formation of 1 mol of a substance at `O^(@)` C and 1 atm. Pressure from its elements

C

Formation of 1 mol of a substance at 298 K and 1 atm. Pressure from its elements

D

Formation of 1 mol of a substance an any reaction at 298K and 1 atm. Pressure

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