In Dumas' method of estimation of nitrogen `0.35 g` of an organic compound gave `55mL` of nitrogen collected at `300K` temperature and `715 mm` pressure. The percentage composition of nitrogen in the compound would be `: (` Aqueous tension at `300K =15 mm)`

Options

A. 15.45
B. 16.45
C. 17.45
D. 14.45

Answer

B

Explanation

Calculating `V_2` from gas equation :
`(p_1 V_1)/(T_1)= (p_2 V_2)/( T_2)`
or `(700 xx 55)/(300)= (760 xx V_2)/( 273)`
`V_2 = (700 xx 55 xx 273)/( 300 xx 760) `
`= 46.098` mL
`% N = (28)/( 22400) xx (46.098)/( 0.35)xx 100`
`= 16.46%`