Gases in Liquids

Q. 97.The density of ch4 gas present in 1 Litre vessel at 2atm and 400 k is

Q. at what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the earths atmosphere?guven mass of oxygen molecule =2.76\ast10raise to -26kg and boltzmann const.=1.38\ast10raise to -23J/

Q. The Henry's law constant for the solubility of $N_2$ gas in water at $298K$ is $1.0\times 105atm$. The mole fraction of $N_2$ in air is $0.8$. The number of moles of $N_2$ from air dissolved in $10$ moles of water at $298K$ and $5atm$ pressure is

1. $4\times {10}^{-6}$
2. $4\times {10}^{-4}$
3. $4\times {10}^{-5}$
4. $5\times {10}^{-4}$

Q. Calculate the concentration of $C{O}_2$ in a soft drink that is bottled with a partial pressure of $4atm$ over the liquid at ${25}^{\circ }C$. The Henry's law constant for $C{O}_2$ in water at ${25}^{\circ }C$ is $3.1\times {10}^{-2}atm/mole-litre$.

1. $0.129mol/litre$
2. $129.03mol/litre$
3. $0.224mol/litre$
4. $224.3mol/litre$

Q. What is Henry's constant for neon dissolved in water given $C_{Ne}=23.5mL/L$ solution and STP volume ($22,414$ mL/mole gas) and pressure (1 atm)?

1. $0.00105$
2. $0.11004$
3. $0.00115$
4. $0.00015$

Q.

Dry air was passed successively through a solution of 5 gm of a solute in 80 gm of water and then through pure water. The loss in weight of solution was 2.50 gm and that of pure solvent 0.04 gm . What is the molecular weight of the solute?

1. 70.31

2. 7.143

3. 714.3

4. 80

Q. The solubility of $N_2$ in water at 300 K and 500 torr, partial pressure is 0.01 g $L^{-1}$. The solubility (in g $L^{-1}$) at 750 torr partial pressure is:

1. 0.015
2. 0.02
3. 0.0075
4. 0.005

Q. The Henry's law constant for the solubility $of{N}_2$ gas in water at $298K$ is $1.0\times {10}^5$ atm. The mole fraction of $N_2$ in air is $0.8$. The number of moles of $N_2$ from air dissolved in $10$ moles of water at $298K$ and $5$ atm pressure is:

1. $4.0\times {10}^{-4}$
2. $4.0\times {10}^{-5}$
3. $4.0\times {10}^{-6}$
4. $5.0\times {10}^{-4}$

Q. Solubility of a salt in water depends on:

1. only hydration energy
2. only lattice energy
3. Both lattice & hydration energy
4. Excitation energy

Q. Dissolution of gases in liquids is generally

1. Exothermic
2. Endothermic
3. Isothermal
4. Dissolution of gases is not possible

Q. How many grams of carbon dioxide gas is dissolved in a 1 L bottle of carbonated water if the manufacturer uses a pressure of 2.4 atm in the bottling process at 25${}^o$C?
Given: $K_H$ of $C{O}_2$ in water $=$ 29.76 atm/(mol/L) at 25${}^o$C

1. $3.88$ g
2. $4.90$ g
3. $5.33$ g
4. $3.52$ g

Q. in a reversible process it is said that the systemand the surroundings should be in thermodynamical equilibrium which includes mechanical equilibrium. so how does work take place in a situation where there is mechanical equilibrium

Q. The solubility of ammonia in water is 52.9 whereas solubility of $N_2$ is only 0.0019. Reason for this is

1. $N_2$ is heavier than $N{H}_3$
2. $N{H}_3$ reacts with water forming $N{H}_{4}OH$
3. Water reacts with $N_2$ forming $N_{2}O$
4. $N{H}_3$ is pyramidal in shape, whereas $N_2$ is linear

Q. The solubility of $N_2$ in water is $2.2\times {10}^{-4}g$ in $100g$ of $H_{2}O$ at ${20}^{\circ }C$ when the pressure of $N_2$ over the solution is $1.2atm$.

1. $1.25\times {10}^{-3}g/100g{H}_{2}O$
2. $1.49\times {10}^{-3}g/100g{H}_{2}O$
3. $2.56\times {10}^{-3}g/100g{H}_{2}O$
4. $1.83\times {10}^{-3}g/100g{H}_{2}O$

Q. The Henry's law constant for the solubility of oxygen in water is $3.3\times {10}^{-4}$ M/atm at 12${}^o$C. Air is 21 mol% oxygen. How many grams of oxygen can be dissolved in one litre of a trout stream at 12${}^o$C at an air pressure of 1.00 atm?

1. $2.22$ mg
2. $0.11222$ mg
3. $0.333$ g
4. $0.422$ g

Q. Compute the molar solubility of water that is saturated with air.

1. $2.56\times {10}^{-2}M$
2. $3.58\times {10}^{-5}M$
3. $4.44\times {10}^{-6}M$
4. $2.78\times {10}^{-4}M$

Q. 1 kg of water under a nitrogen pressure of 1 atmosphere dissolves $0.02$ gm of nitrogen at $293$ K.

1. $7.2\times {10}^{-4}$ atm
2. $7.5\times {10}^4$ atm
3. $7.4\times {10}^4$ atm
4. $7.2\times {10}^4$ atm