In this reaction, 4.58 L of O2 were formed at 745mm Hg and 308 K. How many grams of Ag2O decomposed.

2 Ag2O----> 4 Ag + O2
Please help I'm very confused

2 answers

Use PV = nRT and solve for n = moles oxygen.
Use stoichiometry to convert moles O2 to moles Ag2O, convert to grams Ag2O
As Dr. Bob said:

Use PV=nRT to solve for n = moles of oxygen

Convert 745mmHg to 1 atm, thats 745mmHg x 1 atm/760mmHg = 0.98atm

(0.98)(4.58L)/(0.0821)(308K) = 0.18mol O2

Use Stoichiometry to convert O2 moles to moles Ag20, then convert that to grams Ag2O

0.18molO2 x 2molAg2O/1molO2 x 231.735gAg2O/1molAg2O = 83.4gAg2O

*the exact answer is 82.3g bc I rounded different then the book, but this is how you get to that number
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