In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen col

Question

In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the organic compound is $\_\_\_\_$ %.
(Aqueous tension at 300 K is 15 mm ).

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