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Question

The enthalpies of the elements in their standard states are assumed to be:

A
zero at 298 K
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B
unit at 298 K
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C
zero at all temperatures
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D
zero at 273 K
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Solution

The correct option is A zero at 298 K
The enthalpies of the element in their standard states are assumed to be zero at 298 K. At standard state, all elements have zero enthalpies of formation ( elements like oxygen, nitrogen in the form of gases, solid carbon in form of graphite etc).

Hence, option A is correct.

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