In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of
nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm , the percentage of nitrogen in the compound is
Text Solution
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Mass of the substance taken 
Volume of nitrogen collected 
Atmospheric pressure 
Room temperature 
Aqueous tension at 
Actual pressure of the gas 
To convert the volume at experimental conditions to volume at S.T.P.
Experimental value at S.T.P.
Substituting these values in the gas equation
we get, 
To convert volume at S.T.P. into mass
22400 mL of nitrogen at STP weight 
of nitrogen at S.T.P. will weight
To calculate percentage of nitrogen
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