using the standard enthalpies of formation, what is the standard enthalpy of reaction? co(g) h2o(g)⟶co2(g) h2(g)

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together