Methanogenesis Use enthalpies offormation from the textbook to calculate the standard enthalpy ofreaction for the following methane-generating reaction ofmethanogenic bacteria, given Hf of CHNH2(g) = -22.97kJ/mol: 4 CH3NH2(g) + 2 H2O(I) -> 3 CH4(g) + CO2(g) + 4NH3(g) _______ kJ Methanogenesis Use enthalpies offormation from the textbook to calculate the standard enthalpy ofreaction for the following methane-generating reaction ofmethanogenic bacteria, given Hf of CHNH2(g) = -22.97kJ/mol: 4 CH3NH2(g) + 2 H2O(I) -> 3 CH4(g) + CO2(g) + 4NH3(g) _______ kJ
Explanation / Answer
4 CH3NH2(g) + 2 H2O(I) -> 3 CH4(g) + CO2(g) + 4NH3(g) H f of H2O = -285.83 KJ / mol H f of CH4 is = - 74.87 KJ/mol H f of CO2 = -393.509 KJ / mol H f of NH3 = - 45.9 KJ / mol Hf of CH3NH2(g) = -22.97 kJ/mol H of the above reaction is H = Hproducts - H reactants =( 3 * H CH4 + H CO2 + 4 * H NH3 ) - ( 4 *H CH3NH2 + 2 * H H2O ) = -138.179 KJ / mol