A) N2 (g) + 4H2(g) + 2O2(g) + S(rhombic) (NH4)2SO4 (s)
B) 2N2 (g) + 8H2(g) + 4O2(g) + 2S(rhombic) 2(NH4)2SO4 (s)
C) N2 (g) + 4H2(g) + 2O2(g) + 1/2S2(g) (NH4)2SO4 (s)
D) All of the above
B) 2N2 (g) + 8H2(g) + 4O2(g) + 2S(rhombic) 2(NH4)2SO4 (s)
C) N2 (g) + 4H2(g) + 2O2(g) + 1/2S2(g) (NH4)2SO4 (s)
D) All of the above
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The standard enthalpy of formation of a specified compound is the (hypothetical) change in enthalpy accompanying the formation of 1 mole of that compound from its constituent elements. Both the compound and its elements should be taken in their standard states, which generally involves the most stable form of each at a standard temperature and pressure, frequently 25°C and 1 bar.
In the equations above, this is most closely represented by option (A).
In the equations above, this is most closely represented by option (A).