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Calculate the pH at 25 degrees C of a 0.25-M aqueous solution of oxalic acid (H2C2O4). (Ka1 and Ka2 for oxalic acid are 6.5 x 10^-2 and 6.1 x 10^-5, respectively.)
Calculate the total mass of acetic acid dissolved in the solution contained in the volumetric flask (f) The mass(g) of acetic acid dissolved in the solution contained in the volumetric flask came drom the 25.00 ml vinegar sample.
How many reducing ends are in a molecule of corn starch (amylopectin) that contains 200,000 residues with a branch every 100 residues? Explain
The equilibrium constant Kc equals 1.6 10-2 at 200°C. What are the moles of substances in the equilibrium mixture at 200°C if we start with 0.021 mol HBr in a 1.3-L vessel?
Lindane, a powerful insecticide, is a member of this group. The molar mass of lindane is 290.8. How many atoms of carbon does a molecule of lindane contain
A titanium bicycle frame contains the same amount of titanium as a titanium cube measuring 6.6cm on a side. 1) Use the density of titanium to calculate the mass in kilograms of titanium in the frame.
which one of the liquids would you expect to have the lowest vapor pressure at room temperature?
How many grams of NaCl must be added to 250g water to lower the vapor pressure by 1.30 mm Hg at 40 degrees C assuming complete dissociation?
Calculate the pH during the titration of 20.00 mL of 0.1000 M hydrazine N2H4(aq), with 0.1000 M HCl after 20.25 mL of the acid have been added. Kb of hydrazine = 1.7 x 10-6
For a particular redox reaction MnO2 is oxidized and Ag+ is reduced to Ag write a balanced equation
The reaction 2NO (g)-> N2 (g) + O2 (g) has a H = 180.5 kJ. How much heat will be required to produce 44.8 L of NO by the reverse reaction?
The absorbance of a blank solution prepared in the same manner was 0.025. The molar absorptivity of the copper complex is 7.90 x 103 L.mol?1.cm?1. Calculate the weight percent copper in the rock sample
cube of a silver-colored metal with a volume of 64 cm3 has a mass of 672 g. The density of pure silver is 10.5 g/cm3. Is the metal pure silver?
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