How would you use a standard enthalpies of formation table to determine the change in enthalpy for these reactions?
#2CO(g) + O_2(g) -> 2CO_2(g)#
#CH_4(g) + 2O_2(g) -> CO_2(g) + 2H_2O(l)#
#2H_2S(g) + 3O_2(g) -> 2H_2O(l) + 2SO_2(g)#
Our equation of interest to apply for this problem is:
Where n and m are moles of substances. We'd subsequently look the values up, do the math, and voila, so in my text, here's what I get. The reason some reactants/products have 0 formation energy is because when the molecule is the most stable form, no energy is needed to form.