1.

At idential tempreture and pressure , yhe rate of diffusion of hydrogen gas is 3sqrt3 times that of a hydrocarbon having moleculer formula C_(n)H_(2n-2) What is the value of n?

Answer»

8
4
3
1

Solution :`gamma_(H_(2))/(gammac_(n_(H_(2n+2))))=sqrt(mc_(n)H_(2n+2)/m_(H_(2)))Rightarrow3sqrt3=sqrt(m_(c_(n_(H_(2n+n))))/2)`
SQUARING on both sides and rearring
`27xx2=m_(c_(n_(H_(2n-n))))`
`54=n(12)+(2n-2)(1)`
`54=12n+2n-2=14n-2`
`n=(54+2)/14=56/14=4` .


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