In Duma's method for estimation of nitrogen, 
of organic compound gave 
of nitrogen gas collected at 
and 
pressure. If vapour pressure of water at 
is 
, the value of percentage of nitrogen in the compound is 
.
Text Solution
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(13) Determination of volume of nitrogen Given, mass of substance 
Atmospheric pressure 
Room temperature 
Vapour pressure of water at 
Actual vapour pressure of dry gas
Now to determine the volume of 
, we use
The mass of nitrogen in 
gas is calculated by using concept of gram molar volume.
of 
at STP weighs 
of 
at STP weigh 
Percentage of 
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