Which favor high temperature
a) N2 + H2 ⇌NH3 ΔH = 415 kj/mole
b) 25O2 + O2 ⇌25O3 ΔH = -150 kj/mole
c) H2 + I2 ⇌ 2HI ΔH = 450 kj/mole
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