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A gravimetric method for Al was found to give results that are constantly low by 0.70 mg Al. Calculate the parts per thousand error when 750 mg sample containing approximately 12% Al is analyzed by this method.
Write and balance the given chemical equation and Write a balanced equation for this reaction
You need to produce a buffer solution that has a pH of 5.10. You already have a solution that contains 10 mmol (millimoles) of acetic acid.
The student found that 8.67mL of NaOH solution was needed to titrate a 0.0544g sample of the acid to the equivalence point. Calculate the mass of unknown required for a 30.0mL titration.
liquid nitrogen has a density of 0.807 g/ml at -195.8 C, if 1.00 L of N2 is allowed to warm to 25 C at a pressure
A 1.00 L solution contains 4*10^-4 M Cu(NO3)2 and 1.6*10^-3 M ethylenediamine (en). the Kf for Cu(en)2^+2 is 1*10^20. What is the concentration of Cu^+2 (aq) in this solution
Calculate how long will it take for a sample of radionuclide with a half-life of 27.1 days decay to 1.0% of its original value.
Calculate Delta H kJ/mol NH4NO3 for the solution process. NH4NO3 ( s) yields NH4 (there is a plus sign above the four)(aq) + ^ + NO3(negative sign above the three) (aq)
Using a table of standard reductions, determine what the potential of each reduction below would be versus the S.C.E. a. Ag+ (aq) + e - ? A(s) b. Ni2+(aq) + 2e- ? Ni (s)
A crystalline unit cell contains oxygen atoms on all edges of the cell and rhenium atoms on each corner. What is the formula for rhenium oxide
Calculate the quantity of energy produced per gram of reactant for the fusion of two H - 2 (atomic mass = 2.014102 amu) atoms to form He-3 (atomic mass = 3.016029 amu) and one neutron.
Helium gas at 104.0 kPa and 372.0 K is located within a cylinder with a piston. Initially the gas occupies 0.3000 m3. While a constant force, F, is applied to the end of the piston so that the pressure inside the cylinder is held constant at 104.0..
A protein biochemist attempted to determine the amino acid sequence of a decapeptide. Use the results from the trypsin, chymotrypsin, and cyanogen bromide treatments to suggest the amino acid sequence of this decapeptide.
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