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Recent questions tagged solutions

Suggest the most important type of intermolecular attractive interaction in the following pair : n-hexane and n-octane

asked Aug 5, 2014 by sreemathi.v

1 answer

At 300 K, 36 g of glucose present in a litre of its solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of the solution is 1.52 bars at the same temperature, what would be its concentration?

asked Aug 5, 2014 by sreemathi.v

1 answer

Two elements A and B form compounds having formula $AB_2$ and $AB_4$. When dissolved in 20 g of benzene ($C_6H_6$), 1 g of $AB_2$ lowers the freezing point by 2.3 K whereas 1.0 g of $AB_4$ lowers it by 1.3 K. The molar depression constant for benzene is 5.1 K $kg mol^{–1}$. Calculate atomic masses of A and B.

asked Aug 5, 2014 by sreemathi.v

1 answer

A 5% solution (by mass) of cane sugar in water has freezing point of 271K. Calculate the freezing point of 5% glucose in water if freezing point of pure water is 273.15 K

asked Aug 5, 2014 by sreemathi.v

1 answer

A solution containing 30 g of non-volatile solute exactly in 90 g of water has a vapour pressure of 2.8 kPa at 298 K. Further, 18 g of water is then added to the solution and the new vapour pressure becomes 2.9 kPa at 298 K. Calculate: vapour pressure of water at 298 K.

asked Aug 5, 2014 by sreemathi.v

1 answer

A solution containing 30 g of non-volatile solute exactly in 90 g of water has a vapour pressure of 2.8 kPa at 298 K. Further, 18 g of water is then added to the solution and the new vapour pressure becomes 2.9 kPa at 298 K. Calculate: molar mass of the solute

asked Aug 5, 2014 by sreemathi.v

1 answer

Calculate the mass of a non-volatile solute (molar mass 40 g $mol^{–1}$) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.

asked Aug 5, 2014 by sreemathi.v

1 answer

The vapour pressure of water is 12.3 kPa at 300 K. Calculate vapour pressure of 1 molal solution of a non-volatile solute in it.

asked Aug 5, 2014 by sreemathi.v

1 answer

Heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components are 105.2 kPa and 46.8 kPa respectively. What will be the vapour pressure of a mixture of 26.0 g of heptane and 35 g of octane?

asked Aug 5, 2014 by sreemathi.v

1 answer

An aqueous solution of 2% non-volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molar mass of the solute?

asked Aug 5, 2014 by sreemathi.v

1 answer

What is meant by positive and negative deviations from Raoult's law and how is the sign of $\Delta_{mix}H$ related to positive and negative deviations from Raoult's law?

asked Aug 5, 2014 by sreemathi.v

1 answer

The partial pressure of ethane over a solution containing $6.56 × 10^{–3}$ g of ethane is 1 bar. If the solution contains $5.00 ×\times 10^{–2}$ g of ethane, then what shall be the partial pressure of the gas?

asked Aug 4, 2014 by sreemathi.v

1 answer

State Henry’s law and mention some important applications?

asked Aug 4, 2014 by sreemathi.v

1 answer

Why do gases always tend to be less soluble in liquids as the temperature is raised?

asked Aug 4, 2014 by sreemathi.v

1 answer

What role does the molecular interaction play in a solution of alcohol and water?

asked Aug 4, 2014 by sreemathi.v

1 answer

A sample of drinking water was found to be severely contaminated with chloroform $(CHCl_3$) supposed to be a carcinogen. The level of contamination was 15 ppm (by mass): determine the molality of chloroform in the water sample.

asked Aug 4, 2014 by sreemathi.v

1 answer

A sample of drinking water was found to be severely contaminated with chloroform $(CHCl_3$) supposed to be a carcinogen. The level of contamination was 15 ppm (by mass): express this in percent by mass

asked Aug 4, 2014 by sreemathi.v

1 answer

An antifreeze solution is prepared from 222.6 g of ethylene glycol $(C_2H_6O_2$) and 200 g of water. Calculate the molality of the solution. If the density of the solution is $1.072 g mL^{–1}$, then what shall be the molarity of the solution?

asked Aug 4, 2014 by sreemathi.v

1 answer

A solution is obtained by mixing 300 g of 25% solution and 400 g of 40% solution by mass. Calculate the mass percentage of the resulting solution.

asked Aug 4, 2014 by sreemathi.v

1 answer

How many mL of 0.1 M HCl are required to react completely with 1 g mixture of $Na_2CO_3$ and $NaHCO_3$ containing equimolar amounts of both?

asked Aug 4, 2014 by sreemathi.v

1 answer

A solution of glucose in water is labelled as 10% w/w, what would be the molality and mole fraction of each component in the solution? If the density of solution is $1.2 g mL^{–1}$, then what shall be the molarity of the solution?

asked Aug 4, 2014 by sreemathi.v

1 answer

Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is $1.504 g mL^{–1}$?

asked Aug 4, 2014 by sreemathi.v

1 answer

Define the following term : Mass percentage

asked Aug 4, 2014 by sreemathi.v

1 answer

Define the following term : Molarity

asked Aug 4, 2014 by sreemathi.v

1 answer

Define the following term : Molality

asked Aug 4, 2014 by sreemathi.v

1 answer

Define the following term : Mole fraction

asked Aug 4, 2014 by sreemathi.v

1 answer

Give an example of a solid solution in which the solute is a gas.

asked Aug 4, 2014 by sreemathi.v

1 answer

Define the term solution. How many types of solutions are formed? Write briefly about each type with an example.

asked Aug 4, 2014 by sreemathi.v

1 answer

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

asked Jul 23, 2014 by sreemathi.v

1 answer

Twenty grams of hemoglobin in 1L solution at 300K is separated from pure water by a semipermeable.At equilibrium,the height of solution (density $1gcm^{-3}$) in a tube dipped in solution is found to be 83.1mm higher than in the tube dipped in water.If $g=10ms^{-2}$ ,the molar mass of hemoglobin is about

asked Jul 23, 2014 by sreemathi.v

1 answer

A solution containing $8.6gL^{-1}$ of urea (molar mass $60gmol^{-1}$) is isotonic with a 5% solution of unknown solute.The molar mass of the solute will be

asked Jul 23, 2014 by sreemathi.v

1 answer

The molar mass of sodium chloride determined by osmotic pressure would be

asked Jul 23, 2014 by sreemathi.v

1 answer

The freezing point of a solution containing 36g of a compound (empirical formula : $CH_2O$) in 1.20 kg of water is found to be $-0.93^{\large\circ}C$.The molecular formula of the solute is

asked Jul 23, 2014 by sreemathi.v

1 answer

A solution contains 10g of a solute and 116g of acetone at $30^{\large\circ}$C.Its vapour pressure is 290 Torr.If the vapour pressure of pure acetone is 300 Torr at $30^{\large\circ}$C,the molar mass of solute is

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of a pure liquid A is 10.0 Torr at $27^{\large\circ}C$,One gram of B is dissolved in 20g of A,the vapour pressure is lowered to 90 Torr.If the molar mass of A is $200gmol^{-1}$,the molar mass of B is

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of a solution of 5g of a nonelectrolyte in 100g water at a particular temperature is 2950 Pa and that of pure water at the same temperature is 3000 Pa.The molar mass of the solute is

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of a solution having 2.0g of a solute X(molar mass $32gmol^{-1}$) in 100g of $CS_2$ (vapour pressure 854 Torr) is 848.9 Torr.The molecular formula of the solute is

asked Jul 22, 2014 by sreemathi.v

1 answer

The molar mass of benzoic acid in benzene as determined by depression in freezing point method corresponds to

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of a pure liquid A is 80 mmHg at 300K.It forms an ideal solution with liquid B.When the mole fraction of B is 0.4,the total pressure was found to be 88 mmHg.The vapour pressure of liquid A would be

asked Jul 22, 2014 by sreemathi.v

1 answer

A binary solution contains 4 mol of A and 6 mol of B.Its vapour pressure is found to be 460mm Hg.To this solution,when 10 mol of B is added,its vapour pressure becomes 480mm Hg.The vapour pressures of pure A and pure B,respectively,are

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of n-hexane and n-heptane are 46 and 13mm Hg.If the vapour pressure of a solution of these two liquids is 38mmHg,the mole fraction of n-hexane in solution is

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of pure benzene and toluence are 160 Torr and 60 Torr,respectively.The mole fraction of benzene in vapour phase in contact with equimolar solution of benzene and toluene would be

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of pure liquid is 70 Torr at $27^{\large\circ}C$.The vapour pressure of a solution of this liquid and another liquid (mole fraction 0.2) is 84 Torr at $27^{\large\circ}C$.The vapour pressure of pure liquid B at $27^{\large\circ}C$ is

asked Jul 22, 2014 by sreemathi.v

1 answer

Which of the following solutions is expected to show negative deviations from Raoult's law?

asked Jul 22, 2014 by sreemathi.v

1 answer

Which of the following solutions is expected to show positive deviations from Raoult's law?

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour pressure of a solvent in a solution is proportional to

asked Jul 22, 2014 by sreemathi.v

1 answer

The vapour-pressure lowering of a solvent is proportional to

asked Jul 22, 2014 by sreemathi.v

1 answer

An azeotropic solution of two liquids has a boiling point higher than either of the boiling points of the two liquids when it

asked Jul 22, 2014 by sreemathi.v

1 answer

Which of the following is true?

asked Jul 22, 2014 by sreemathi.v

1 answer

The volume required to prepare 2.0L of 3.0M $H_2SO_4$ solution from 96% $H_2SO_4$ solution (density $1.83gmL^{-1}$) is

asked Jul 22, 2014 by sreemathi.v

1 answer

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