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A buffer that contains 0.500 M of acid, HY and 0.274 M of its conjugate base Y-, has a pH of 5.14. What is the pH after 0.0457 mol of Ba(OH)2 are added to 0.670 L of the solution?
Initially A sample of a substance of 23.43 g weight has temperature 24.2 °C then it absorbs heat and reached to temperature 122.0 degree Celsius; calculate the specific heat of this substance if it absorbs 2167 joule heat
calculate the expected change in temperature for 4.5 g of NH4NO3 dissolved in 100.0 mL of H20. Assume that the calorimeter absorbs no heat. (ie. Ccal=0)
A buffer solution is prepared by mixing 0.500 L of 1.50 M HF and 0.400 L of 0.95M KF. What is the pH of this buffer? [Ka(HF) = 6.30 × 10-4]
Calculate the volume of carbon dioxide at 20.0 C and .960 atm produced from the complete combustion of 3.50 kg of methane. Compare your result with the volume of CO2 produced from the complete combustion of 3.50 kg of propane (C3H8)
What mass of calcium metal could be obtained from one kg of limestone that is 50.0% pure CaCO3?
Given the thermodynamic data in the data table below, calculate the equilibrium constant for the reaction: 2SO2 (g) + O2(g/0 2SO3(g), Substance Delta Hf (kj/mol) Delta S (J/K *mol)
A flask contains 0.120 mol of liquid bromine, rm Br_2. Determine the number of bromine molecules present in the flask.
Several rate constants were measured for a particular reaction at several temperatures. It was found that k = 0.0173 at 923 K, and k = 0.00919 at 773 K. What is the activation energy, Ea , for this reaction?
How much PV work is done (in kilojoules) and what is the value of deltaE (in kilojoules) for the reaction of 6.50g of acetylene at atmospheric pressure if the volume change is -2.80 L?
Explain the hazards associated with 1.0 moles of Ch3COOH solution, 0.10 moles of BaCL2 sloution, and 0.10 moles Na2C2O4 solution?
A pipette is used to add 46 mL of 0.3 M Pb(NO3)2 to a 273.0 mL solution of 0.3 M NaF. Determine the equilibrium concentration of Pb2+(aq) in the final solution. Ksp(PbF2)=3.6E-8
What mass of sucrose should be combined with 461 g of water to make a solution with an osmotic pressure of 8.85 atm at 310 K? (Assume the density of the solution to be equal to the density of the solvent.)
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