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A 48.6 mL sample of a 0.455 M aqueous hydrocyanic acid solution is titrated with a 0.475 M aqueous solution of barium hydroxide. How many milliliters of barium hydroxide must be added to reach a pH of 9.042?
Complete the following potential energy diagrams for the formation of B and C by sketching the energy curve for each product. The diagrams are
calculate the average rate of disappearance of A for each 40-s interval, in units of mol/s. c.) what additional information would be needed to calculate the rate in units of concentration per time?
How would the following modifications of the experimental procedure used in this experiment affect the mass of the precipitate collected? Indicate whether the mass would be greater than, unchanges, or less than that obtained. Briefly explain the ..
Specific heat of ice: 2.09g*c Specific heat of liquid water: 4.18j/g*c Enthalpy of fusion: 334j/g Enthalpy of vaporization: 2250j/g
An enzyme-catalyzed reaction produces a product that has a maximum absorbance at 412nm. The extinction coefficient is 4000M^-1cm^-1, A l0 to-l dilution of the enzyme is made and 20 u.L of the dilution are put into a cuvette with 80 ul of water and..
A sample of hydrogen has a volume of 582mL when the temperature is 48.6 deg C as well as the pressure is 1.116 atm. Explain what will be the volume of the gas at STP
Acetylene gas (C2H2) used in welding, produces an extremely hot ?ame when it burns in pure oxygen according to the reaction 2 C2H2(g)+5 O2(g) -→ 4 CO2(g)+2 H2O(g)
A graduated cylinder contains 145mL of water. A 10.0g piece of iron (density = 7.86g/cm3 ) and a 22.0g piece of lead are added.
24.4 grams of metal was heated in boiling water and then dropped in a calorimeter containing 100 grams of water. The temperature before the metal was dropped in was 23 C and the final temperature was 25.1 C. specific heat
A certain quantity of a gas occupies 61.3 mL at 68 ?C. If the pressure remains constant, what would be the volume of the gas at 128 ?C?
A 0.16 mol dm-3 solution (3.50 cm3) of s-butyllithium in toluene was added to a solution of styrene (8.40 g) in toluene (200 cm3). After complete conversion of the styrene, isoprene (28.00 g) was added. When the isoprene had completely polymerized, t..
As a part of this exercise, you will need to prepare 100 mL of a 0.1 M phosphate buffer at pH 7.5, and you need to calculate the amounts of NaH2PO4 and K2HPO4 that you need to use in your buffer.
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