A 6.22 kg mixed-mineral sample contains chromite (FeCr2O4) as the only chromium-bearing ore. The sample is subjected to an industrial process, using a ferrosilicon alloy as a reducing agent, which quantitatively converts all of the chromium into 11.9 kg of a ferrochrome alloy (stainless steel) which is 18.9% Cr by mass.

What is the percentage of chromite (FeCr2O4) in the original sample?

Stainless steel is mostly iron but also contains a substantial amount of chromium along with small amounts (that can be ignored) of a few other elements. Suppose a cube of stainless steel, which measures 0.400 m on a side, has a density of 7.60 g/cm3 and is 18% chromium by mass. How many pounds of chromium are contained in this stainless steel cube?

Stainless steel is an alloy of iron ,nickel and chromium. 0.500g sample of the steel is dissolved and diluted to 250ml. a 50 ml aliquot required 36.16 ml of 0.0500M EDTA in order to completely titrate all the ions. A second 50ml aliquot had chromium masked through addition of hexamethylenetetriamine, and required 30ml of the same EDTA solution to complete the titration. finally, a third aliquot had both iron and chromium masked through the addition of pyrophosphate aliquot required 0.68ml of EDTA solution to completely titrate. Determine iron, nickel, and chromium percentages of original sample (15 points)

Stainless steel is an alloy of iron, chromium, and nickel, having approximately 15.5% chromium. In an assay to discover how much chromium is present, the steel is oxidize in acid to form chromate ion. The resulting solution is treated with excess lead(II) ion to produce a stable precipitate of lead chromate, according to the following reaction:

CrO42-(aq) + Pb2+(aq) ==> PbCrO4(s)

How many mL of 14.2% lead (II) nitrate solution (density=1.36 g/mL) should be used to assure 50% excess Pb2+ for the reaction involving a 3.2922 gram stainless steel sample? Round your answer to the nearest whole mL.