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Question 1.7.2.3: 0.3 g of coal sample on Kjehldahl’s analysis gave ammonia to......

0.3 g of coal sample on Kjehldahl’s analysis gave ammonia to just neutralise 30 mL of 0.1 N H_{2}SO_{4}. Calculate the percentage of nitrogen in the coal sample.

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Weight of coal sample = 0.3 g
Volume of H_{2}SO_{4} used = 30 mL
Normality of H_{2}SO_{4}= 0.1 N
Percentage of nitrogen = \frac{ volume  of  H_{2}SO_{4} used  normality \times 1.4}{weight  of  coal  sample  taken}
=\frac{30 \times0.1\times 1.4}{ 0.3}=14%  Percentage of nitrogen = 14%

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