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Solid benzoic acid, C6H5COOH(s), is often used to determine the heat capacity of a bomb calorimeter, because the constant volume heat of combustion of this compound is known with high precision: qV = 26.434 kJ/g. When a 2.088 g sample of C6H5COOH(s) was burned in a particular bomb calorimeter, the temperature increased by 11.77 oC. In a second experiment, a 1.217 g sample of a compound with the formula C6H14O(l) was burned in the same calorimeter. The temperature increased by 10.08 oC. Use these data, plus the information given below for CO2 and H2O, to estimate the standard enthalpy of formation, of H, at 25 oC for this compound of H values at 25 oC for CO2(g) and H2O(l) are 394 kJ mol 1 and 286 kJ mol 1, respectively.
we use 1 g of unknown acid added with 120 mL of distilled water ,the solution filtered , then we took 25 mL of this unknown acid for titration. we use NaOH base for titration
Stoichiometry explained in this solution, If the yield of CO2 (g) from the reaction of butane with hydrogen peroxide is only 80.65%, with how many grams of butane and hydrogen peroxide
If the electrochemical cell is allowed to operate as a gavanic cell, which solution species will be oxidized, which solution species will reduce. write the sybolic representation for the galvanic cell.
A new atom is found that has 3 isotopes with masses of 262, 263 and 265. If the first is 0.17 abundant and the second is 0.41 abundant, what is the atomic mass of the element (give your answer to 2 decimal places).
Which is the stronger base, HSO4- or H2O? b. Which is the stronger base, H2O or OCl-?
2 K + Cl2 ---> 2 KCl How many grams of KCl is produced from 2.50 g of K and excess Cl2. From 1.00 g of Cl2 and excess K?
What is the molarity of a solution that contains 35.0 g of vitamin B1 hydrochloride (molar mass = 337 g/mol ) in 110 g of solution?
How long would it take for 1.50mol of water at 100.0 °C to be converted completely into steam if heat were added at a constant rate of 21.0 J/s?
Calculate the equilibrium partial pressures of all species when CO and Cl2, each at an intitial partial pressure of 1.53 atm, are introduced into an evacuated vessel at 600 K.
Compute the change in temperature when 2 g of sodium chloride is dissolved in 270.0 mL of water initially at 25 C. The heat capacity of water is 4.184 J/mL/K. Neglect the heat capacity of the NaCl.
A buffer solution is prepared by dissolving 1.50 g each of benzoic acid, C6H5CO2H, and Sodium Benzoate, NaC6H5CO2, in a 150.00 ml of solution. The Ka for benzoic acid = 6.3E-5.
How much heat is released when 4.50 g of methane gas is burned in a constant-pressure system? CH4 (g) + 2O2(g) -> CO2 (g) + 2H2O(l) H=-890kJ
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