Calculate the heats of combustion for the following reactionsfrom the standard e

Question

Calculate the heats of combustion for the following reactionsfrom the standard enthalpies of formation. A) C2H2 (g) + 3 O2 (g) --> 2 CO2 (g) + 2 H20 (l) B) 2 H2S (g) + 3 O2 (g) --> 2 H2O (l) + 2 SO2 (g) C2H2 H = 227 kJ/mol CO2 H = -393.5 O2 H = 0 H2O H = -285.840 H2S H = -20.2 SO2 H = -296.8 Calculate the heats of combustion for the following reactionsfrom the standard enthalpies of formation. A) C2H2 (g) + 3 O2 (g) --> 2 CO2 (g) + 2 H20 (l) B) 2 H2S (g) + 3 O2 (g) --> 2 H2O (l) + 2 SO2 (g) C2H2 H = 227 kJ/mol CO2 H = -393.5 O2 H = 0 H2O H = -285.840 H2S H = -20.2 SO2 H = -296.8

Explanation / Answer

We Know that :       The given Reaction is :      A) C2H2 (g) + 3O2 (g) --> 2 CO2 (g) + 2 H20 (l)     Hrxn. = H (Products) - H (reactants)                 = 2 ( -393.5 ) + 2 ( -285.840 ) ] KJ - [ 227 + 3 (0 ) ]                 = -1585.68 KJ        B) 2 H2S(g) + 3 O2 (g) --> 2 H2O (l) + 2SO2 (g)          Hrxn. = H (Products) - H (reactants)                       = 2 ( -285.840 ) + 2 ( -296.8 ) ] KJ - [ 2 ( -20.2 ) ]KJ                        =   -1124.88 KJ  

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