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18. What conc...

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18. What concentration of nitrogen should be present in a glass of water at room temperature? Assume a temperature of 25^° C, a total pressure of 1 atm anda temperature of mole fraction of nitrogen in atmosphere an {(K_H for nitrogen =8.42×10^{-7M/mm Hg.

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Q. What concentration of nitrogen should be present in a glass of water at room temperature? Assume a temperature of

25^{o}

C, a total pressure of

1

atmosphere and mole fraction of nitrogen in air of

0.78

K_{H}

= 8.42 \times 10^{- 7}

Q. Calculate the concentration of nitrogen present in the water. Assuming that the temperature is

25^{o} C

, total pressure is

1 a t m

and mole fraction of nitrogen is

0.78

K_{H}

= 8.42 \times 10^{- 7} M / m m H g

]

25^{\circ} C

1

atm pressure, the mole fraction of

N_{2}

0.90

. Calculate the concentration of

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present in a glass of water at C. (Given

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N_{2}

25^{\circ} C

8.5 \times 10^{- 7}

Q. In Dumas method for the estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm of Hg pressure. If the aqueous tension at 300 K is 25 mm of Hg, what is the percentage of nitrogen in the compound (approximately)?

Q. Estimate the total number of air molecules (inclusive of oxygen, nitrogen, water vapour and other constituents) in a room of capacity 25.0 m3 at a temperature of 27 °C and 1 atm pressure.

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