Q.28 Potassium superoxide, K O 2 , is utilised in closed system breathing apparatus. Exhaled air contains C O 2  
and H 2 O , both of which are removed and the removal of water generates oxygen for breathing by the 
reaction 
  4 K O 2 (s) + 2 H 2 O (l) ->  3 O 2 (g) + 4KOH(s) 
The potassium hydroxide removes C O 2 from the apparatus by the reaction : 
KOH (s) + C O 2 (g)  --> KH C O 3 (s) 
(a) What mass of K O 2  generates 20 gm of oxygen ? 
(b) What mass of C O 2 can be removed from the apparatus by 100 gm of K O 2  ? 

 

Dear Student,

The computation are expressed below,


part (a)moles of KO2=20 g O232 gmol O2×4 mol KO23 mol O2=0.833 molgm of KO2=0.833 mol ×71.097 gmol = 59.224 gmpart (b)moles of CO2=moles of KO2=100 g71.097 gmol=1.407 molmass of CO2=1.407 mol×44.01 gmol=61.92 gm

Regards.

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