Question

The energy released as heat when glycine is burned in a bomb calorimeter is 969.6 kJ.mol- at 25 °C so standard enthalpy of combustion (AU = -969.6 kJ.mol). From the chemical equation, prove that the difference between AU and AcH is due to contributions from reactants and products. -9,69,6. (469,6 [10] NH2CH2COOH (9) +202) – 2002() + H20 () + N2®

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Answer 1

Energy released in a Bennb. Calorimeter ( Censtrueut volume - means energy is released. System) * Ey soy = -969,6 kJ/motey . R energy Also, Cimbertion of glycine is as follows in Change in Internal HEN-CH COOH (A) + LOL (g) -32cą (g) + ŞMore +_ N219) H - U + PV Also PV = nRT DHE AU + A(PV) AH - AU + Almer) AH = AU + Ang RT gaseous moles of products a (Mg) products - Engl reactants gaseous moles of Д", - пы, + + - то, Ang = 1/2 + 2 - [ 29 . reactants Dng = +1 }.£} = 10990 So, SH - AU - Ang RT Universal gas cenebaut. AH - AU = X 8.314 X 298k DU - AH2 ** 8.3148298 3 - 619.383.50-0.6193 KJ . So, difference in DUA AH depends on Ang which in turn depends on gaseous products & gaseous reactants.