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MCQ
Standard enthalpy (heat) of formation is usually defined at:
Unit-8 Energetics
A 100 degrees C and 2 atm
B 0 K and 1 atm
C 100 degrees C and 1 atm
D 25 degrees C (298 K) and 1 atm
Explanation

Standard conditions for enthalpy changes are 298 K (25 degrees C) and 1 atm pressure.

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