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Among pressure of the system and the sur...

Among pressure of the system and the surroundings, which one is represented by 'P' in the equation `H=U+PV`? What would be the change in enthalpy for the reaction `A_(2)(s)+B_(2)(g) to 2AB(g)`?

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CHHAYA PUBLICATION-CHEMICAL THERMODYNAMICS-VERY SHORT TYPE QUESTIONS
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