From the unbalanced equations below, identify the one that does not represent a redox reaction. a. h2co3(aq) → co2(g) + h2o(l) b. c(s) + h2o(g) → co(g) + h2(g) c. s2o32- (aq) + i2(s) → s4o62+ (aq) + i-(aq) d. febr2(aq) + br2(l) → febr3(aq) reset selection

a non redox reaction occurs when there is not a transfer of electrons. for redox reactions, which are reduction-oxidation reactions, a change in the oxidation number occurs. elements that are reduced gain electrons, and elements that are oxidized lose electrons.

explanation:

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.