Question

Gummy bears decompose rapidly and explosively in molten potassium chlorate. Both decomposition and combustion reactions happen simultaneously according to the balanced equation: C12H22011(s) + 8 KClO3(1) --> 12 CO2(g) + 11 H2O(g) + 8 KCl(aq) Using the AHºf values below, calculate the standard enthalpy change for this reaction. (Report your answer in standard notation.) C12H22011 (8) KCIO3 (1) CO2 (g) H2O (g) KCl (aq) A Hºf (kJ/mol) -2225.5 -397.73 -393.51 -241.82 -436.7 AH° rxn = * kJ

Answer 1

Standard enthalphy of reaction=standard ehthlpy of formation of products-standard enthalpy of formation of reactant. ∆Hf^o of products=12(-393.51) +11( -241.82) +8(-36.7) =-4722.12-2660.02-293.6=-7675.74 ∆Hf^o of reactants=-2225.5+8(-397.73) =-5407.34 ∆Hof reaction =-2268.402kj