Ilus How many moles of O2 are consumed
if 20 moles of SO2 are produced?
2CuFeS2 + 502 + 2Cu + 2FeO + 4802

The correct answer is b

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.