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Recent questions tagged ch2

The Van't Hoff factor of benzoic acid in benzene is found to be

asked Aug 8, 2014 by meena.p

1 answer

Ethylene glycol (molar mass =$62g mol^{-1})$ is a common automobile antifreeze.Calculate the freezing point of a solution containing 12.4 of this substance in 100g of water would it be advisable to keep this substance in the car radiator during summer?

asked Aug 8, 2014 by sreemathi.v

1 answer

The degree of dissociation $(\alpha)$ of a weak electrolyte $A_xB_y$ is related to van't Hoff factor (i) by the expression

asked Aug 8, 2014 by meena.p

1 answer

The freezing point of 0.02 mole fraction solution of acetic acid in benzene is 277.4K.Assuming molality equal to molarity,calculate $K_c$ for the equilibrium reaction $2CH_3COOH\;\;\leftrightharpoons\;\;(CH_3COOH)_2$.Given : $T_f$(benzene) =$278.4$ and $K_f$(benzene)=5.0K kg $mol^{-1}$.

asked Aug 8, 2014 by sreemathi.v

1 answer

100mg of a protein is dissolved in just enough water to make 10.0mL of solution.If this solution has an osmotic pressure of 13.3mm Hg at $25^{\large\circ}C$,what is the molar mass of the protein?(R=0.0821Latm $mol^{-1}K^{-1}$,760mm Hg =1atm)

asked Aug 8, 2014 by sreemathi.v

1 answer

Calculate the freezing point depression expected for 0.0711m aqueous solution of $Na_2SO_4$.If this solution actually freezes at $-320^{\large\circ}C$,what would be the value of van't Hoff factor? ($K_f$ for water is $1.86^{\large\circ}Cmol^{-1}$)

asked Aug 8, 2014 by sreemathi.v

1 answer

A $ 0.004\;M$ solution of $K_2SO_4$ is isotonic with a $0.010\;M$ Solution of glucose at the same temperature . Tge apparent per cent degree of dissociation of $K_2SO_4$ is

asked Aug 7, 2014 by meena.p

1 answer

The boiling point elevation of 0.30g acetic acid in 100g benzene is 0.0633K.Calculate the molar mass of acetic acid from this data?What conclusion can you draw about the molecular state of the solute in the solution?[Given $K_b$ for benzene = $2.53\;K kgmol^{-1}]$

asked Aug 7, 2014 by sreemathi.v

1 answer

Calculate the temperature at which a solution containing 54g of glucose,$C_6H_{12}O_6$ in 250g of water will freeze ($K_f$ for water =$1.86K kg mol^{-1}$)

asked Aug 7, 2014 by sreemathi.v

1 answer

If boiling point of an aqueous solution is $100.1^{\large\circ}$C.What is its freezing point?Given,latent heat of fusion and vaporisation of water as 80 cal $g^{-1}$ and 540 cal $g^{-1}$ respectively.

asked Aug 7, 2014 by sreemathi.v

1 answer

Which of the following pairs of solutions are expected to be isotonic?

asked Aug 7, 2014 by meena.p

1 answer

The legal limit for human exposure to CO in the work place is 35ppm.Assuming that the density of air is $1.3g/L$,how many grams of CO are in 1.0L of air at the maximum allowable concentration?

asked Aug 7, 2014 by sreemathi.v

1 answer

In the phenomenon of osmosis through the semipermeable membrane

asked Aug 7, 2014 by meena.p

1 answer

A soda water bottle was opened and the soft drink is allowed to come at $27^{\large\circ}$C with the air containing carbon dioxide at $3.8\times 10^{-4}$atm.What would be the concentration of carbon dioxide in the soda water after it had stood open and come to equilibrium.Give value of Henry's constant for aqueous solution of carbon dioxide at $26^{\large\circ}$C is $3.1\times 10^{-2}$ mol lit $^{-1}$ atm$^{-1}$.

asked Aug 7, 2014 by sreemathi.v

1 answer

The osmotic pressure of $0.1\;M$ sodium chloride solution at $27^{\circ}C$ is

asked Aug 7, 2014 by meena.p

1 answer

The Freezing point of ether was lowered by $0.60^{\large\circ}$C on dissolving 2.0gm of phenol in 100g of ether.Calculate the molar mass of phenol and comment on the result.Given $K_f$(ether)=$5.12Kkg mol^{-1}$

asked Aug 7, 2014 by sreemathi.v

1 answer

The osmotic pressure of a solution $(density =1.02\;g \;cm^{-3})$ Containing 50 g glucose $(C_6H_{12}O_6)$ in 1 kg of water at 300 K is

asked Aug 7, 2014 by meena.p

1 answer

The molal elevation constant for water is $0.510Kmol^{-1}kg$.Calculate the boiling point of solution made by dissolving 6g urea in 200g water.

asked Aug 7, 2014 by sreemathi.v

1 answer

A semipermeable membrane used in the measurement of osmotic pressure of a solution allows the passage of

asked Aug 7, 2014 by meena.p

1 answer

The freezing point of a solution containing 0.2g of acetic acid in 20.0g benzene is lowered by $0.45^{\large\circ}$C.Calculate the degree of association of acetic acid in benzene.Assume acetic acid dimerizes in benzene $K_f$ for benzene is $5.12Kmol^{-1}kg$.

asked Aug 7, 2014 by sreemathi.v

1 answer

A solution containing $0.5\;g$ of a solute (molar mass 130 g\;mol^{-1})$ in $50 \;g\;CCl_4$ yields a boiling point elevation of boiling point . The molar mass of solute is about

asked Aug 7, 2014 by meena.p

1 answer

Calculate the freezing point of an aqueous solution of a non-electrolyte having an osmotic pressure 2.0atm at 300K.$K_f=1.86Kmol^{-1}kg$ and $S=0.0821$litre atm $K^{-1}mol^{-1}$

asked Aug 7, 2014 by sreemathi.v

1 answer

Two liquids A and B form ideal solution.At 300K,the vapour pressure of solution containing 1 mol of A and 3 mol of B is 550mm Hg.At the same temperature,if one more mole of B is added to this solution,the vapour pressure of the solution increases by 10mm Hg.Determine the vapour pressures of A and B in their pure states.

asked Aug 7, 2014 by sreemathi.v

1 answer

A very small amount of a non-volatile solute (that does not dissociate) $P_s$ dissolved in $56.8cm^3$ of benzene (density =$0.889gcm^{-3}$).At room temperature,vapour pressure of this solution is 98.88mm Hg while that benzene is 100mm Hg.Find the molality of this solution.If the freezing temperature of this solution is 0.73 degree lower than that of benzene,what is the value of $K_f$ for benzene .

asked Aug 7, 2014 by sreemathi.v

1 answer

Calculate the weight of a non volatile solute having molecular weight 40,which should be dissolved in 114gm octane to reduce its vapour pressure to 80%.

asked Aug 7, 2014 by sreemathi.v

1 answer

The degree of dissociation of $Ca(NO_3)_2$ in a dilute aqueous solution containing 7g of salt per 100g of water at $100^{\large\circ}$C is 70%.Calculate the vapour pressure of solution.

asked Aug 7, 2014 by sreemathi.v

1 answer

$0.1M$ $KMnO_4$ is used for the following titration $S_2O_3^{2-}+KMnO_4^-+H_2O\rightarrow MnO_2(s)+SO_4^{2-}+OH^-$.What volume of the solution in mL will be required to react with 0.158 of $Na_2S_2O_3?

asked Aug 7, 2014 by sreemathi.v

1 answer

Find the molality of a solution containing a non-volatile solute if the vapour pressure is 2% below the vapour pressure of pure water.

asked Aug 7, 2014 by sreemathi.v

1 answer

The vapour pressure of pure benzene at $25^{\large\circ}C$ is 639.7mm of mercury and the vapour pressure of a solution of a solute in benzene at the same temperature is $631.9$mm of mercury.Calculate the molality of the solution.

asked Aug 7, 2014 by sreemathi.v

1 answer

How many millilitres of 0.5M $H_2SO_4$ are needed to dissolve 0.5g of copper (II) carbonate ?

asked Aug 7, 2014 by sreemathi.v

1 answer

The solvent $CS_2$ has enthalpy of vapourization of $352\;J\;g^{-1}$ and boiling point equal to $320\;K$. The value of $K_b$ for this solvent is about.

asked Aug 7, 2014 by meena.p

1 answer

Molarity of $H_2SO_4$ is 18M.If density is $1.8gcm^{-3}$,calculate its concentration in $mol kg^{-1}$ solvent $(H_2O)$ (ie) Molality.

asked Aug 7, 2014 by sreemathi.v

1 answer

An antifreeze solution is prepared from 222.6 of ethylene glycol and 200g of water.If the density of the solution is $1.072gmL^{-1}$,then what shall be the molarity of solution.

asked Aug 7, 2014 by sreemathi.v

1 answer

A solvent of molar mass $84.2 \;g\;mol^{-1}$ and boiling point $81.4^{\circ}C$ has boiling point elevation constant equal to $ 2.79 \;K\;kg\;mol^{-1}$. Its molar enthalpy of vapourization will be about

asked Aug 7, 2014 by meena.p

1 answer

An antifreeze solution is prepared from 222.6 of ethylene glycol and 200g of water.Calculate the molality of the solution.

asked Aug 7, 2014 by sreemathi.v

1 answer

A sucrose solution in 50 g water boils at $100.15^{\circ}C$ , If this solution is heated till its temperature is $100.375^{\circ}C$, how much of water is evaporated ? Given :$ K_b(water)=0.52\;K\;kg\;mol^{-1}$

asked Aug 7, 2014 by meena.p

1 answer

An involatile solute A dimerizes in a solvent as $2A \rightleftharpoons A_2$ . If m is the molarity of solute in the solution , then the equilibrium constant of the reaction is given as

asked Aug 6, 2014 by meena.p

1 answer

The freezing point of 0.02mole fraction solution of acetic acid in benzene is 277.4K.Assuming molality equal to molarity,calculate $K_c$ for the equilibrium reaction $2CH_3COOH \;\;\leftrightharpoons\;\;(CH_3COOH)_2$.

asked Aug 6, 2014 by sreemathi.v

1 answer

The elevation in boiling point when $20.16\;g$ of freshly prepared $CuCl_2$ (relative molar mass : $134.4$) is dissolved in $1\;kg$ of water $(K_b=0.52\;kg\;K \;mol^{-1})$ is

asked Aug 6, 2014 by meena.p

1 answer

To $500cm^3$ of water $3.0\times 10^{-3}$kg of acetic acid is added .If 2.3% of acetic acid is dissociated.What will be the depression of freezing point?$K_f$ and density of water are $1.86$K kg/mol and $0.997g/cm^3$ respectively.

asked Aug 6, 2014 by sreemathi.v

1 answer

When mercuric iodide is added to an aqueous solution of potassium iodide, the

asked Aug 6, 2014 by meena.p

1 answer

The freezing point of a solution containing 0.2g of acetic acid in 20.0g benzene is lowered by $0.45^{\large\circ}$C.Calculate the degree of association of acetic acid in benzene.Assume acetic acid dimerises in benzene.$K_f$ for benzene =$5.12Kmol^{-1}Kg$

asked Aug 6, 2014 by sreemathi.v

1 answer

The elevation of boiling point of water produced by dissolving $1.17 g$ sodium chloride in $100 g$ water $K_b=0.512\;K\;kg\;mol^{-1})$ is

asked Aug 6, 2014 by meena.p

1 answer

If boiling point of an aqueous solution is 100.1$^{\large\circ}C$,what is its freezing point.Given,latent heat of fusion and vaporization of water as $80cal g^{-1}$ and $540cal g^{-1}$ respectively.

asked Aug 6, 2014 by sreemathi.v

1 answer

The boiling point of water at $735$Torr is $99.07^{\circ}C$ . The mass of $NaCl$ added in $100\;g$ water $(K_b=0.51\;K\;kg\;mol^{-1})$ to make its boiling point $100^{\circ}C$ is

asked Aug 6, 2014 by meena.p

1 answer

For an ideal solution containing a nonvolatile solute, Which of the following expression is correctly represented ?

asked Aug 6, 2014 by meena.p

1 answer

A very small amount of a non-volatile solute (that does not dissociate) is dissolved in $56.8cm^3$ of benzene (density $=0.889gcm^{-3}$).At room temperature vapour pressure of this solution is 98.88mm Hg while that of benzene is 100 mm Hg.Find the molality of this solution.If the freezing temperature of this solution is 0.73 degree lower than that of benzene .What is the value of $K_f$ for benzene?

asked Aug 6, 2014 by sreemathi.v

1 answer

Which of the following solvents has the largest value of $K_f$?

asked Aug 6, 2014 by meena.p

1 answer

The molar mass and the freezing point of camphor are $152.2\;g\;mol^{-1} $ and $178.4^{\circ} C $ respectively . The cryoscopic constant of camphor is $ 37.7\;K\;kg\;mol^{-1}$, the molar enthalpy of fusion of camphor is about

asked Aug 6, 2014 by meena.p

1 answer

Find the molality of a solution containing a non-volatile solute if the vapour pressure is 2% below the vapour pressure of pure water.

asked Aug 6, 2014 by sreemathi.v

1 answer

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