How many moles of O₂ would be required to generate 13.0 mol of NO₂ in the reaction below assuming the reaction has only 83.9% yield? 2 NO (g) + O₂ (g) → 2 NO₂ (g)

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?