【Daily Question】May 6, 2018: +2 Wealth for participation； +3 to +10 wealth for correct answers
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Fill-in-the-blank: When using the Kjeldahl method to determine the nitrogen content in organic substances, 2.50 g of sample was weighed, and 27.82 mL of a HCl standard solution with a concentration of 0.9971 mol/L was used. The volume of HCl consumed in the blank determination was 2.73 mL. Then the mass fraction of nitrogen in this sample is ( ). 14.01%
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