The nitrogen content of organic compounds can be determined by the Dumas method. The compound in question is first reacted by passage over hot CuO(s):

The gaseous products are then passed through a concentrated solution of KOH to remove the CO₂. After passage through the KOH solution, the gas contains N₂ and is saturated with water vapor. In a given experiment, a 0.253- g sample of a compound produced 31.8 mL of N₂ saturated with water vapor at 25^oC and 726 torr. What is the mass percent of nitrogen in the compound? (The vapor pressure of water at 25^oC is 23.8 torr.)

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0에 Compound → N2(g) + CO2(g) + H2O(g) Cuos)