Precipitation reaction;
K2CrO4(aq) + 2AgNO3(aq) >>>>>>> Ag2CrO4(s) + 2KNO3(aq)
1 mol of pot.chromate reacts with 2 moles AgNO3 completely to form 1 mol Ag2CrO4(s) .
Available moles of AgNO3 (0.00190) are less stoichiometrically for complete reaction of moles of pot.chromate given (0.014200) .
For 0.014200 mols pot.chromate , we need = (2mol.AgNO3/1mol-pot.chromate)×0.014200mol-pot.chromate = 0.0284 mol -AgNO3 required for complete reaction.
Thus AgNO3 is the limiting reagent and amounts of product formed depends on the amount of limiting reagent available.
0.00190 mol AgNO3 will produce = (1mol - Ag2CrO4/2mol-AgNO3)×0.00190mol-AgNO3 = 0.00095 mol Ag2CrO4 .
Mass of Ag2CrO4 will form = moles × molar mass = 0.00095moles × 331.73g/mol = 0.315 g of Ag2CrO4.
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