1972 Ap Chemistry Free Response Answers Upd

(a) Calculate $\Delta H^\circ$ for the reaction. (b) Calculate $\Delta S^\circ$ for the reaction. (c) Calculate $\Delta G^\circ$ at $298\text K$.

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Combustion yields 22.0 g CO2 and 9.00 g H2O from 10.0 g sample. Find empirical formula. Steps: convert CO2 → C moles, H2O → H moles, divide by smallest, get whole-number ratio → empirical formula. (a) Calculate $\Delta H^\circ$ for the reaction

K2CO3+2HCl→CO2+2KCl+H2Ocap K sub 2 cap C cap O sub 3 plus 2 cap H cap C l right arrow cap C cap O sub 2 plus 2 cap K cap C l plus cap H sub 2 cap O 1mol1 m o l CO2cap C cap O sub 2 comes from 1mol1 m o l : Part B: Percentages of KOHcap K cap O cap H KClcap K cap C l Total HClcap H cap C l initially : HClcap H cap C l reacted with : HClcap H cap C l excess (from titration) : HClcap H cap C l reacted with KOHcap K cap O cap H : Mass of KOHcap K cap O cap H : Mass of KClcap K cap C l : Final Percentages : 2. Thermodynamics and Electrochemistry Have a specific 1972 free response prompt you need help with