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0.8 g of an organic compound is analysed for nitrogen by Kjeldahl's method. If the nitrogen content is found to be 42%, how many mL of (M/2) H2SO4 are neutralized by the ammonia liberated? (N = 14)
- 12 mL
- 24 mL
- 36 mL
- 48 mL
Correct answer: 24 mL
Solution
Mass N = 0.336 g -> 0.024 mol NH3; H2SO4 needed = 0.012 mol; at 0.5 M that is 24 mL.
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