310. Determine which of the following reactions is possible under standard conditions at 25 C:
a) N2(g) 1/2O2(g)=N2O(g)
b) 4HCl(g) O2(g)=2Cl2(g)=2Cl2 2H2O(l)
c) Fe2O3 3CO(g)=2Fe(c) 3CO2(g)
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