2H2(g) + O2(g) -----> 2H2O(l) ΔGº = -474.4 kJ
N2O5(g) + H2O(l) -----> 2HNO3(l) ΔGº = -37.6 kJ
1/2N2(g) + 1/2O2(g) + 1/2 H2(g) ------> HNO3(l) ΔGº = -79.91 kJ
N2O5(g) + H2O(l) -----> 2HNO3(l) ΔGº = -37.6 kJ Turn this equation around, change sign.
2HNO3(l) → N2O5(g) + H2O(l) ΔGº = +37.6 kJ
1/2N2(g) + 1/2O2(g) + 1/2 H2(g) ------> HNO3(l) ΔGº = -79.91 kJ Multiply this equation by 2.
N2(g) + O2(g) + H2(g) ------> 2HNO3(l) ΔGº = -159.82 kJ
2H2(g) + O2(g) -----> 2H2O(l) ΔGº = -474.4 kJ Multipy this equation by ½
H2(g) + ½O2(g) -----> H2O(l) ΔGº = -237.2 kJ and reverse it.
H2O(l) → H2(g) + ½O2(g) ΔGº = +237.2 kJ
Add the three equations together.
N2(g) + 3O2(g) + H2(g) ------> 2HNO3(l) ΔGº = -159.82 kJ
H2O(l) +N2(g) + 3O2(g) + H2(g) +2HNO3(l) → H2(g) + ½O2(g) +2HNO3(l) + N2O5(g) + H2O(l)
Simplify
N2(g) + 5/2O2(g) + → N2O5(g)
Add the ΔG values 237.2 -159.82 + 37.7 =
&frac52;
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Verified answer
2H2(g) + O2(g) -----> 2H2O(l) ΔGº = -474.4 kJ
N2O5(g) + H2O(l) -----> 2HNO3(l) ΔGº = -37.6 kJ
1/2N2(g) + 1/2O2(g) + 1/2 H2(g) ------> HNO3(l) ΔGº = -79.91 kJ
N2O5(g) + H2O(l) -----> 2HNO3(l) ΔGº = -37.6 kJ Turn this equation around, change sign.
2HNO3(l) → N2O5(g) + H2O(l) ΔGº = +37.6 kJ
1/2N2(g) + 1/2O2(g) + 1/2 H2(g) ------> HNO3(l) ΔGº = -79.91 kJ Multiply this equation by 2.
N2(g) + O2(g) + H2(g) ------> 2HNO3(l) ΔGº = -159.82 kJ
2H2(g) + O2(g) -----> 2H2O(l) ΔGº = -474.4 kJ Multipy this equation by ½
H2(g) + ½O2(g) -----> H2O(l) ΔGº = -237.2 kJ and reverse it.
H2O(l) → H2(g) + ½O2(g) ΔGº = +237.2 kJ
Add the three equations together.
H2O(l) → H2(g) + ½O2(g) ΔGº = +237.2 kJ
N2(g) + 3O2(g) + H2(g) ------> 2HNO3(l) ΔGº = -159.82 kJ
2HNO3(l) → N2O5(g) + H2O(l) ΔGº = +37.6 kJ
H2O(l) +N2(g) + 3O2(g) + H2(g) +2HNO3(l) → H2(g) + ½O2(g) +2HNO3(l) + N2O5(g) + H2O(l)
Simplify
N2(g) + 5/2O2(g) + → N2O5(g)
Add the ΔG values 237.2 -159.82 + 37.7 =
&frac52;