Question

Silver (I) oxide (Ag2O) decomposes completely at temperatures in excess of 300 °C to produce metallic silver and oxygen gas. When 1.6 grams of impure Ag2O is decomposed and allowed to cool to STP, the reaction is found to yield 72.1 mL of oxygen gas. What is the percentage of Ag2O in the original impure sample?

Answer 1

Answer on Question #63767 - Chemistry – General Chemistry

Silver (I) oxide (Ag₂O) decomposes completely at temperatures in excess of 300°C to produce metallic silver and oxygen gas. When 1.6 grams of impure Ag₂O is decomposed and allowed to cool to STP, the reaction is found to yield 72.1 mL of oxygen gas. What is the percentage of Ag₂O in the original impure sample?

Solution.

2Ag₂O → 4Ag + O₂↑

M(Ag₂O) = 108×2 + 16 = 232 g/mol

2×232 g Ag₂O – 22.4 L O₂

x g Ag₂O – 0.0721 L O₂

x = 0.0721×2×232/22.4 = 1.5 g Ag₂O

w(Ag₂O) = 1.5/1.6 = 0.9375

w(Ag₂O) = 0.9375×100 = 93.75%

Answer: w(Ag₂O) = 93.75%

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