Assuming that dry air contain 79 - N 2 and 21 - O 2 by volume- Find the density of moist air at 25- C and 1-0 atm when the relative humidity is 60 - The vapour pressure of water at 25- C is 23-76 mm Hg-A- 1-33 g-LB- 1-1 gL-LgC- 1-19 g-ID- 0-96 g -L

The correct option is C From the given data , we have, vapour pressure of H_2O = 0.6 × 23.76 mm Hg = 14.256 mm Hg The number of moles of gas in 1L dry air is: ...

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Standard XII

Chemistry

Dalton's Law of Partial Pressures

Assuming that...

Question

Assuming that dry air contain $79 % N_{2} a n d 21 % O_{2}$ by volume. Find the density of moist air at $25^{\circ}$ C and 1.0atm when the relative humidity is $60 %$ . The vapour pressure of water at $25^{\circ}$ C is 23.76 mm Hg.

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Solution

The correct option is C

From the given data , we have, vapour pressure of $H_{2} O$ = 0.6 $\times$ 23.76 mm Hg = 14.256 mm Hg
The number of moles of gas in 1L dry air is:
$N_{g a s} = \frac{p V}{R T} = \frac{1 \times 1}{0.0821 \times 298}$ = 0.0409 mol
The number of moles of $N_{2} = 0.0409 \times 0.79 = 0.0323 m o l a n d m a s s o f N_{2}$ = 0.0323 $\times$ 28=0.9044g

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Assuming that dry air contain $79 % N_{2} a n d 21 % O_{2}$ by volume. Find the density of moist air at $25^{\circ}$ C and 1.0atm when the relative humidity is $60 %$ . The vapour pressure of water at $25^{\circ}$ C is 23.76 mm Hg.

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Assuming that dry air contain 79%N2 and 21% O2 by volume. Find the density of moist air at 25∘C and 1.0atm when the relative humidity is 60%. The vapour pressure of water at 25∘C is 23.76 mm Hg.

The correct option is C From the given data , we have, vapour pressure of H2O = 0.6 × 23.76 mm Hg = 14.256 mm Hg The number of moles of gas in 1L dry air is: Ngas=pVRT=1×10.0821×298 = 0.0409 mol The number of moles of N2=0.0409×0.79= 0.0323 mol and mass of N2 = 0.0323 × 28=0.9044g

Assuming that dry air contain $79 % N_{2} a n d 21 % O_{2}$ by volume. Find the density of moist air at $25^{\circ}$ C and 1.0atm when the relative humidity is $60 %$ . The vapour pressure of water at $25^{\circ}$ C is 23.76 mm Hg.