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Because Br2 gas is not the standard state for bromine at 25°C—it's standard state is liquid, this means that the enthalpy of formation is not zero. In addition, the entropy is not zero because the formation reaction is Br2 (l) --> Br2 (g). Thus the Gibbs Free Energy of formation is not zero. At 25°C, hydrogen is in its standard state as a gas, so the formation reaction is H2 (g) --> H2 (g). Therefore, the enthalpy of formation and entropy are zero, and the Gibbs Free Energy of formation is zero. You can think of it also in terms of no spontaneity for an element in standard state to react if left by itself. The Gibbs Free Energy of formation of any element in its standard state is zero.
Last edited by Adam Kwok 3L on Sun Feb 07, 2016 10:46 pm, edited 1 time in total.
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