0.2325 g of organic compound was analysed for nitrogen by Dumas method . 31.7 mL of moist nitrogen was colleted at `25^(@)` C and 755.8 mm of Hg pressure , Calculate the percentage of nitrogen in the sample (Aqueous tension of water at `25^@C ` is 23.8 mm of Hg )

Options

A. 0.18
B. 0.197
C. 0.151
D. 0.202

Answer

C

Explanation

`V_0" of "N_2= (P_1V_1)/(T_1)xx (T_0)/(P_0)`
`=(732xx31.7 xx 273)/(298 xx760)=27.97` mL.
`therefore " % of " N_2=(28xx27.97 xx 100)/(22400 xx 0.2345)=15.1`