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In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is:

1. 18.20
2. 16.76
3. 15.76
4. 17.36

Correct answer: 16.76

Solution

Using the ideal gas equation, the volume of nitrogen is corrected for pressure and temperature. The mass of nitrogen is calculated, and its percentage in the compound is determined as 16.76%.

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