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In Dumas’ method for estimation of nitro...

In Dumas’ method for estimation of nitrogen, 0.3g of an organic compound gave 50mL of nitrogen collected at 300K temperature and 715mm pressure. Calculate the percentage composition of nitrogen in the compound. (Aqueous tension at 300K=15 mm)

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w=0.30g `V_(1)=50ml`
`P_(1)=(P-a)`=715- 15= 700mm of Hg
`T_(1)=300K`
Now `(P_(1)V_(1))/T_(1) = (P_(2)V_(2))/T_(2)`
`implies V_(2)= 41.9ml`
Weight of nitrogen `=28/22400 xx41.9g`
Percentage of Nitrogen= `(28xx41.9)/(22400 xx 0.3) xx100 = 17.46%`
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