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Assertion: The enthalpy of formation of ...

Assertion: The enthalpy of formation of geseous oxygen molecules at `298K` and under of 1 atm is zero.
Reason: The entropy of formation of gaseous oxygen molecules under the same condition is zero.

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Assertion: The enthalpy of formation of gaseous oxygen molecules at 298K and under1 atm is zero. Reason: The entropy of formation of gaseous oxygen molecules under the same condition is zero.

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Assertion(A) : The enthalpy of formation of O_(2) at 1 atmospheric pressure and 298K is zero. Reason(R ) : The enthalpy of formation of all the elements at STP is zero.