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Which of the following would have a standard heat of formation ΔH°f, be zero at 25°C? Group of answer choicesC3CC4C2

Question

Which of the following would have a standard heat of formation ΔH°f, be zero at 25°C?

Group of answer choices
C3
C4
C2

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Solution

The standard heat of formation (ΔH°f) is zero for elements in their standard states. The standard state of an element is its most stable physical state (solid, liquid, or gas) at 1 atm and 25°C.

Looking at the options given: C3, C4, and C2, these are all allotropes of carbon.

C3 and C4 are not standard states of carbon. The most stable form of carbon under standard conditions is graphite, which is a form of C (not C2, C3, or C4).

Therefore, none of the options given (C3, C4, C2) would have a standard heat of formation ΔH°f of zero at 25°C. The correct answer would be C (graphite).

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