Use enthalpies of formation from the textbook to calculate thestandard enthalpy

Question

Use enthalpies of formation from the textbook to calculate thestandard enthalpy of reaction for the following methane-generatingreaction of methanogenic bacteria, given Hf of CH3NH2(g) =-22.97 kJ/mol: 4 CH3NH2(g) + 2 H2O(I) -> 3 CH4(g) + CO2(g) + 4NH3(g) _______ kJ Use enthalpies of formation from the textbook to calculate thestandard enthalpy of reaction for the following methane-generatingreaction of methanogenic bacteria, given Hf of CH3NH2(g) =-22.97 kJ/mol: 4 CH3NH2(g) + 2 H2O(I) -> 3 CH4(g) + CO2(g) + 4NH3(g) _______ kJ

Explanation / Answer

WE Know that :      The given Reaction is :         4 CH3NH2(g) + 2H2O(I) -> 3 CH4(g) + CO2(g) + 4 NH3(g)          H(rxn.) = H (products) - H(reactants)                                     = 3 (-74.6) + ( -393.5) + 4 (-45.9) ] kJ - [ 4(-22.97) + 2 (-285.8) ] kJ                           = -137.42 KJ

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