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1.95 gm of a coal sample was taken for nitrogen estimation by Kjeldahis method.

The ammonia liberated required 9.5ml of 0.4N H2SO4 for neutralisation. Calculate the percentage of Nitrogen in coal sample.

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% of Nitrogen:

= Volume of acid consumed×Normality×1.4weight of coal sample

= 9.5×0.4×1.41.95

N%=2.72%

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