5.76 g Ag2O O2 gas pressure 0.65 L 25℃

5.76 g Ag2O O2 gas pressure 0.65 L 25℃

 

 

Silver oxide decomposes when heated:

2Ag2O(s) → 4Ag(s) + O2(g)

If 5.76 g of Ag2O is heated and the O2 gas produced

by the reaction is collected in an evacuated flask,

what is the pressure of the O2 gas

if the volume of the flask is 0.65 L

and the gas temperature is 25℃?

a) 0.94 atm b) 0.039 atm c) 0.012 atm d) 0.47 atm e) 3.2 atm

 

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Ag2O의 몰질량 = 231.74 g/mol 이므로,

5.76 g / (231.74 g/mol) = 0.024855 mol Ag2O

 

 

 

2Ag2O(s) → 4Ag(s) + O2(g)

Ag2O : O2 = 2 : 1 = 0.024855 mol : ? mol

 

? = 0.024855 / 2 = 0.0124275 mol O2

 

 

 

PV = nRT

( 참고 https://ywpop.tistory.com/3097 )

 

P = nRT / V

= (0.0124275) (0.08206) (273.15 + 25) / (0.65)

= 0.46777 atm

 

 

 

답: 0.47 atm