1.

In a Duma's method 0.3g of an organic compound gave 50ml of nitrogen collected at 27^(@)C and 715mm pressure . The percentage of N is (aqueous tension at 27^(@)C=15mm) :

Answer»

<P>`19.46%`
`21.46%`
`17.46%`
`36.64%`

SOLUTION :VAPOUR pressure of GAS `=715-15`
`=700mm`
To calculate the volume of `N_(2)` at S.T.P
`{:(V_(1)=50mL,V_(2)=?),(p_(1)=700mm,p_(2)760MM),(T_(1)=300K,T_(2)=273K):}`
Applying `(p_(1)V_(1))/(T_(1))=(p_(2)V_(2))/(T_(2))`
or `V_(2)=(p_(1)V_(1)T_(2))/(p_(2)T_(1))`
`:.V_(2)=(700xx50xx273)/(760xx300)`
`=41.9mL`
`22400mL` of nitrogen at S.T.P.weigh `=28g`
`41.9mL` of nitrogen at S.T.P.weigh
`=(28xx41.9)/(22400)`
`=0.0524g`
Percentage of nitrogen
`=(0.0524)/(0.3)xx100=17.46%`


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