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________ is the enthalpy change when 1 mole of a substance is formed from its elements under standard conditions.

A. ΔHθc
B. ΔHθn
C. ΔHθf
D. ΔHθa

Sagot :

Madmaddiecalidn
The correct answer is C
Pstnonsonjokuidn

The correct answer is C. ΔHθf

We define the standard enthalpy of formation as the enthalpy change when one mole of a substance is formed from its elements under standard conditions. The standard conditions are 1 atm pressure, 273 K temperature and 1 M concentration.

The standard enthalpy of formation is denoted using the symbol ΔHθf.

Hence, ΔHθf is the enthalpy change when 1 mole of a substance is formed from its elements under standard conditions.

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