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A 0.4672 g sample of pewter (containing tin, lead, copper, and zinc) was dissolved in acid. The precipitate SnO2·4H2O was removed by filtration. The resulting filtrate and washings were diluted to a total volume of 250.0 mL. A 15.00 mL aliquot was buffered and titration of the lead, copper, and zinc required 35.78 mL 0.001500 M EDTA. Thiosulfate was used to mask the copper in a 20.00 mL aliquot. Titration of the lead and zinc in this aliquot required 34.06 mL of the EDTA solution. Finally, cyanide was used to mask the copper and the zinc in a 25.00 mL aliquot. Titration of the lead required 26.68 mL of the EDTA solution. Determine the composition by mass of the pewter sample
Electron configurations are a shorthand form of an orbital diagram, describing which orbitals are occupied for a given element. Generate the electron configuration of arsenic (As)
A solution contains 1.35 g of Ca(OH)2 in 875 mL of solution. Find the normality of the solution.
What volume of oxygen gas is required to react completely with 1.32 mol of iron according to the following reaction at 0 C and 1 atm
How many of each type of atom are there in a cubic crystal with an edge length of 4nm?
A scientist wishes to compress 50.0 ml of ammonia gas at normal atmospheric pressure to a volume of 1.0 ml. What pressure in atmospheres is necessary?
What is the mole fraction of solute and the molal concentration for an aqueous solution that is 10.0% NaOH by mass
A reaction has a rate constant of 1.27×10^4/s at 29 degrees C and 0.234/s at 79 degrees C. What is the value of the rate constant at 18
cis-dibenzoylethylene is converted to a more stable, new product, ethyl 4-phenyl-4-phenoxy-3-butenoate. What is the structure of the new product
a liver biopsy demonstrates cystathionine synthase and cystathionase levels are normal. this patient may have a deficiency of
For the following reaction, denote whether the equilibrium lies with the products or with the reactants.2NO2(g) + 02(g) 2NO2 (g) Kp = 5.0*1012
Paradichlorobenzene, C6H4Cl2 is a component of mothballs. A solution of 2.00 g in 22.5 g of cyclohexane boils at 82.39 C . The boiling point of pure cyclohexane is 80.70 C. Calculate Kb for cyclohexane. Express the constant numerically in degrees C..
What is the molarity of a 1.304 L solution that is made from 14.80 g of NaCl?Answer in units of M.
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