Substance C (s) co23) 12 H20 0) 023) 5.69 213.6 1306 6991 205.0 2263 3935 285.85
ID: 1078762 • Letter: S
Question
Substance C (s) co23) 12 H20 0) 023) 5.69 213.6 1306 6991 205.0 2263 3935 285.85 1. When 2.50 grams of butyric acid, C3H7COOH, CO2 (g) and H20() are formed with the evolution of 600M acid, C3HyCoOH, is completely combusted at 25 C and 1.00 a of combustion (a) Calculate the molar heat of combustion for butyric acid. (b Write a balanced thermochemical e (c) Calculate the standard (d) If 5.00 g of butyr combustion for butyric acid. equation for the molar heat tree energy of combustion, AGf, for butyric acid at 25 C. ric acid is combusted in a bomb calorimeter, what will be the heat 30.0 capacity of the bomb if the temperature of the bomb goes from 25.0 If 5.00 g of butyric acid is combusted in the part (d) bomb calorimeter surrounded by 1.912 kg of water at 25'C, what will be the final temperafure that is (e) the system? The specific heat of water is 4.184 J/gC. butyric acid. butyric acid. at 25'C ta at the top, calculate the standard heat of fom ration, 1rf, for (G) Write a balanced thermochemical equation for the molar heat of formation e the standard entropy change, AS's, for the formation of butyric acid (i) Calculate the standard free energy of formation AG.f, for butyric acid at 25 G) Would the molar heat of formation for H20 (3) be (more, less, or the same) when Explain. Calculate the volume of air at 25'C and 750. mmHg that is needed to combust 20.0 grams of butyric acid. Air is 200 percent by volume oxygen. compared to the molar heat of formation for H207 (k) Predict how the enthalpy, entropy, free energy, and temperature change in the system during this process. Explain the basis for each of your predictions. 2. (a) When liquid water is introduced into an evacuated vessel at 25'C, some of the water vaporizes. the temperature of the system decreases. Preidct how the enthalpy, entropy, and free energy change in the system during this process. Explain the basis for each of your predictions (b) When a large amount of ammonium chloride is added to water at 25'C, some of it dissolves and If the temperature of the aqueous ammonium chloride system in part (b) were to be increased to 30C predict how the solubility of the ammonium chloride would be affected. Explain the basis for each of your predictions. (c)Explanation / Answer
Substance C (s) co23) 12 H20 0) 023) 5.69 213.6 1306 6991 205.0 2263 3935 285.85