Question

3. Highly oxidized chromium ("hexavalent chromium") in the form of K Cr207, potassium dichromate, can be converted to less toxic, still useful for chromium plating K Cr04, potassium chromate by heating it with potash, K2CO3. KCr207 + K CO3 à 2K CrO4 + CO What mass of potassium chromate is produced by the reduction of 100 g of potassium dichromate? [Molar masses: K, 39.0983 g: Cr, 51.996 g. 1 lb - 453.592 g]

Answer 1

K₂ Croy & K CO₂ → 2kqcron & CO2 29412 melee of potasiumdichromale = , 0.3399 moles I mole of ķerot gives - 2 moles of Kącroy 0.3399 mees of kerser gives → 2X0.3399 → 016798 moles of Kącron man of kcron a molestimolarmars = 0.6798x19h.2 = 132g