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

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zero at 298 K and 1 atm

unity at 298 K and 1 atm

Zero at all temperatures

zero at 273 K and 1 atm

answer is A.

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Detailed Solution

For the substances, thermodynamic properties like enthalpy $(∆ H)$ of the elements under standard conditions at 298 K and 1 atm to be zero.

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