GATE CE 2022 Set 1 — Question 59
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Environmental Engineering → Wastewater Quantity & Sewerage → Chemical Parameters
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Question
A wastewater sample contains two nitrogen species, namely ammonia and nitrate. Consider the atomic weight of N, H, and O as 14 g/mol, 1 g/mol, and 16 g/mol, respectively. In this wastewater, the concentration of ammonia is 34 mg NH/liter and that of nitrate is 6.2 mg NO/liter. The total nitrogen concentration in this wastewater is _______ milligram nitrogen per liter. (round off to one decimal place)
Correct answer
29 to 30
Solution
1.Calculate Nitrogen concentration from Ammonia (NH):
Molecular weight of NH g/mol.Nitrogen content in 34 mg/L NH mg/L as N.
2.Calculate Nitrogen concentration from Nitrate (NO):
Molecular weight of NO g/mol.Nitrogen content in 6.2 mg/L NO mg/L as N.
3.Total Nitrogen concentration:
Total N = 28 + 1.4 = 29.4 mg/L.Rounding to one decimal place, the value is 29.4.Continue learning with Success Tracker
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