Silver oxide decomposes completely at temperatures in excess

Silver oxide decomposes completely at temperatures in excess of 300 c to produce metallic silver and oxygen gas. A 1.60 g sample of impure Ag2o gives 72.1 mL of O2measured at STP. What is the percentage of Ag2O in the original sample?

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Solution

Ag2O-> Ag + O2

72.1 mL of O2 at STP corresponds to

1 mole at STP has 22.4 litres

Moles of O2 -> 72.1/22400=3.21875*10^-3

Molecular Mass is 231.7 gms for Ag2O

Weight of Ag2O - 231.7 * 3.21875*10^-3=0.7457gm

%=0.7457/1.60*100=46.6%