b (7) 4 st (3) 2 (2) 3 (4) 1 (70. T...
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b (7) 4 st (3) 2 (2) 3 (4) 1 (70. The vapour density of mixture containing NO, and N,O, is 38.3 at 27°C. The moles of No, in 100 g of the mixture (1) 0.563 (2) 0.437 (3) 0.20 (4) 0.665 co

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Chemistry
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Let the total number of moles ( =1 ) let the number of moles of ( mathrm{NO} 2=mathrm{X} ) so number of moles of ( mathrm{N} 2 mathrm{O} 4=1-mathrm{x} ) molar mass of mixture ( =2 ) x vapour density ( =2 times 38.3=76.6 ) Now ( x times 46+(1-x) 92=76.6 ) ( 46 x+92-92 x=76.6 ) ( 46 x=15.4 ) ( x=15.4 / 46=0.335 ) ( % ) age of ( mathrm{NO} 2=33.5 % ) ( % ) age of ( mathrm{N} 2 mathrm{O} 4=66.5 % ) Number of moles ( mathrm{NO} 2 ) in ( 100 mathrm{g} ) of mixture ( =0.335 times 100 / 76.6=0.437 )
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