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A mixture of NO2 and N2O4 has a vapour d...

A mixture of `NO_2` and `N_2O_4` has a vapour density of 38.3 at 300K. What is the number of moles of `NO_2` in 110g of the mixture?

A

0.698

B

0.480

C

6.98

D

2.589

Text Solution

Verified by Experts

The correct Answer is:
A,C
`(pH)_1=pK_a+log(y//x)`
`(pH)_2=pK_a+log(x//y)`
`(pH)_2-(pH)_1=log(x/y)-log(y/x)=1 implies log(x^2/y^2)=1`
so `x^2/y^2=10 implies x/y=3.162`
`(pH)_2+(pH)_1=2pK_a+log(y/x)+log(x/y)`
`=2 pK_a=9.5`
so, `pK_a=9.5/2=4.75`
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