Lead(II) chromate (PbCrO₄) is used as the yellow pigmentin traffic lanes, but is banned from house paint because of therisk of lead poisoning. It is produced from chromite (FeCr₂O₄),an ore of chromium:4FeCr₂O₄(s) +8K2CO3(aq)+ 7O₂(g)→2Fe₂O₃(s)+ 8K₂CrO₄(aq)+ 8CO₂(g) Lead(II) ion then replaces the Kion. If a yellow paint is0.511% PbCrO₄by mass, how many grams of chromite areneeded per kilogram of paint?

3.77 g of potassium is placed in 375 ml of 0.850 mol/l chromium (iii) nitrate solution as follows 3 k (s) + cr(no3)3 (aq) d 3 kno3 (aq) + cr (s) determine which reactant is the limiting reagent and calculate the mass, in grams, of cr produced.

(a) When aqueous solutions of Cr(NO3)3 and Nil2 are mixed, does a precipitate form? (b) Write a balanced equation for the precipitation reaction that occurs when aqueous solutions of cobalt(II) nitrate and potassium carbonate are combined. Be sure to include states such as (s) or (aq).

The compound sodium thiosulfate pentahydrate, Na2S2 O3-5H2O, is important commercially to the photography business as "hypo," because it has the ability to dissolve unreacted silver salts from photographic film during development. Sodium thiosulfate pentahydrate can be produced by boiling elemental sulfur in an aqueous solution of sodium sulfite. S8 (s) + Na2 SO3 (aq) + H2O(1) → Na2 S2 O3-5H2 O(s) (unbalanced) What is the theoretical yield of sodium thiosulfate pentahydrate when 3.25 g of sulfur is boiled with 13.1 g of sodium sulfite? Sodium thiosulfate pentahydrate is very soluble in water. What is the percent yield of the synthesis if a student doing this experiment is able to isolate (collect) only 5.26 g of the product?