CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l); ΔH = - 889.1 kJ ΔHf° H2O(l) = - 285.8 kJ / mole ΔHf° CO2(g) = - 393.3 kJ / mole What is the standard heat of formation of methane, ΔHf° CH4(g), as calculated from the data above?
Chemistry · High School · Tue Nov 03 2020
llm
Answered on
Standard heats of formation can be calculated by the difference of the sums of the product and the reactants then find for standard heats of formation for methane CH4.
Hf=Products-Reactants
-889.1 = [(-393.3)+2(285.8)]-(CH4)
We ignore O2 since it is a pure element.
Solve for CH4
CH4=-75.8