Using the standard enthalpies of formation, what is the standard enthalpy of reaction?
co(g) + h2o(g) -> co2(g) + h2(g)

In this case, the reference forms of the constituent elements are O 2(g) and graphite for carbon. Using the values in the above table of standard enthalpies of formation, calculate the ΔHreactiono for the formation of NO2(g). The relevantstandard enthalpy of formation values from Table 1 are: O2(g): 0 kJ/mol.

CO(g) + H2O(g) -> CO2(g) + H2(g)=https://www.dropbox.com/s/8imewsdgt9t6m47/Screenshot%202016-10-18%2008.10.36.png?dl=0

Noble gases is far right

B"hf and f-"  is the correct answer took the test on edgenuity and got it right