The standard molar enthalpy of a substance is the enthalpy of the substance at what pressure .

1 atm

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2 atm

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0 atm

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Non of these

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Solution

The correct option is A 1 atm
The standard molar enthalpy of a substance is the enthalpy when one mole of the substance is at standard state ( $1 a t m$ ).
Hence option A is the right answer.

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