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प्रश्न
In the estimation of nitrogen present in an organic compound by Dumas method 0.35 g yielded 20.7 mL of nitrogen at 15° C and 760 mm pressure. Calculate the percentage of nitrogen in the compound.
उत्तर
Volume of N2 at NTP = `("V" xx "P")/("t" + 273) xx 273/760`
= V0 ml
Substituting the various values in the above equation,
V0 = `(20.7 xx 760)/288 xx 273/760` = 19.62 ml
weight of 19.62 ml of Nitrogen = `28/22400 xx 19.62`g
∴ Percentage of Nitrogen = `28/22400 xx 19.62 xx 100/0.35` = 4.9 %
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