Redox reactions

Question

CH₂O + Ag₂O + OH^- → 2Ag + HCO₂^-+ H₂O

—how many grams of Ag are formed if 2.32 grams of Ag2O are used

—If 0.98 grams of Ag are formed what is the yield of the reaction

Answer 1

Hello, Elie55,

The balanced equation tells us that we'll get 2 moles of silver (Ag) for every one mole of Ag₂O, a molar rationof 2:1. We ca n calculate the moles of Ag₂O by dividing the mass by it's molar mass. We start with 0.0100 moles of Ag₂O, so we would expect to get twice that many moles of Ag, according to the equation. Ha - it assumes we have an honest lab partner.

Multiply the moles of Ag by it's molar mass to get grams Ag, which I find to be 0.980 grams, if everything went accrding the theory.

Since we only got 0.980 grams of Ag, we have a (0.980/1.260)x100% = 45.4% yield.

Bummer,

Bob