1.

The vapour density of PCl_(5) at 473 is found to be 70*2. Find the degree of dissociation of PCl_(5) at this temperature.

Answer»

Solution :Theoretical vapour density of `PCl_(5)` ,
`D=(" Mol.mass of " PCl_(5))/2 = (31 + 5 xx 35*5)/2 = (208*5)/2 = 104 * 25`
Observed vapour density , d= `70*2 `
`:. "Degree of dissociation " (ALPHA)=(104*25 - 70*2)/(70*2)=0*485`


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