Email

Chat with tutors

Login

Ask Questions, Get Answers

Menu X

home ask tuition questions practice papers mobile tutors pricing

X

Recent questions tagged bookproblem

$2\sin ^2\large\frac{3\pi}{4}$$+2\cos^2\large\frac{\pi}{4}$$+2\sec^2\large\frac{\pi}{3}$ =

asked Jul 3, 2018 by pady_1

1 answer

Write the statement "It is necessary to have a password to log on to the server." in the form if $p$ then $q$.

asked Aug 16, 2014 by rvidyagovindarajan_1

1 answer

Write the converse and contra positive of the statement "If it is hot outside then you feel thirsty."

asked Aug 16, 2014 by rvidyagovindarajan_1

1 answer

Write the converse and contra positive of the statement "I go to the beach whenever it is sunny day."

asked Aug 16, 2014 by rvidyagovindarajan_1

1 answer

Write the converse and contra positive of the statement "A positive integer is prime only if it has no divisors other than 1 and itself."

asked Aug 14, 2014 by rvidyagovindarajan_1

1 answer

Determine the osmotic pressure of a solution prepared by dissolving 25 mg of $K_2SO_4$ in 2 litre of water at 25$^{\large\circ}$ C, assuming that it is completely dissociated.

asked Aug 6, 2014 by sreemathi.v

1 answer

Determine the amount of $CaCl_2$ (i = 2.47) dissolved in 2.5 litre of water such that its osmotic pressure is 0.75 atm at 27$^{\large\circ}$ C.

asked Aug 6, 2014 by sreemathi.v

1 answer

The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of 20% is to 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 K if the Henry’s law constants for oxygen and nitrogen at 298 K are $3.30 \times 10^7$ mm and $6.51 \times 10^7$ mm respectively, calculate the composition of these gases in water.

asked Aug 6, 2014 by sreemathi.v

1 answer

Benzene and toluene form ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at 300 K are 50.71 mm Hg and 32.06 mm Hg respectively. Calculate the mole fraction of benzene in vapour phase if 80 g of benzene is mixed with 100 g of toluene.

asked Aug 6, 2014 by sreemathi.v

1 answer

Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot $p_{total}, p_{chloroform}$, and $p_{acetone}$ as a function of $x_{acetone}$. The experimental data observed for different compositions of mixture is:

asked Aug 6, 2014 by sreemathi.v

1 answer

100 g of liquid A (molar mass $140 g mol^{–1}$) was dissolved in 1000 g of liquid B (molar mass $180 g mol^{–1}$). The vapour pressure of pure liquid B was found to be 500 torr. Calculate the vapour pressure of pure liquid A and its vapour pressure in the solution if the total vapour pressure of the solution is 475 torr.

asked Aug 6, 2014 by sreemathi.v

1 answer

Henry’s law constant for the molality of methane in benzene at 298 K is $4.27 \times 10^5$ mm Hg. Calculate the solubility of methane in benzene at 298 K under 760 mm Hg.

asked Aug 6, 2014 by sreemathi.v

1 answer

Vapour pressure of water at 293 K is 17.535 mm Hg. Calculate the vapour pressure of water at 293 K when 25 g of glucose is dissolved in 450 g of water.

asked Aug 5, 2014 by sreemathi.v

1 answer

19.5 g of $CH_2FCOOH$ is dissolved in 500 g of water. The depression in the freezing point of water observed is 1.00$^{\large\circ}$ C. Calculate the van’t Hoff factor and dissociation constant of fluoroacetic acid.

asked Aug 5, 2014 by sreemathi.v

1 answer

Calculate the depression in the freezing point of water when 10 g of $CH_3CH_2CHClCOOH$ is added to 250 g of water. $K_a = 1.4 \times 10^{–3}, K_f = 1.86 K kg mol^{–1}$.

asked Aug 5, 2014 by sreemathi.v

1 answer

The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

asked Aug 5, 2014 by sreemathi.v

1 answer

Calculate the amount of benzoic acid $(C_6H_5COOH)$ required for preparing 250 mL of 0.15 M solution in methanol.

asked Aug 5, 2014 by sreemathi.v

1 answer

Nalorphene $(C_{19}H_{21}NO_3)$, similar to morphine, is used to combat withdrawal symptoms in narcotic users. Dose of nalorphene generally given is 1.5 mg. Calculate the mass of $1.5 \times 10^{–3} m$ aqueous solution required for the above dose.

asked Aug 5, 2014 by sreemathi.v

1 answer

Calculate the mass percentage of aspirin ($C_9H_8O_4$) in acetonitrile ($CH_3CN$) when 6.5 g of $C_9H_8O_4$ is dissolved in 450 g of $CH_3CN$.

asked Aug 5, 2014 by sreemathi.v

1 answer

If the solubility product of CuS is $6 \times 10^{–16}$, calculate the maximum molarity of CuS in aqueous solution.

asked Aug 5, 2014 by sreemathi.v

1 answer

If the density of some lake water is $1.25g mL^{–1}$ and contains 92 g of $Na^+$ ions per kg of water, calculate the molality of $Na^+$ ions in the lake.

asked Aug 5, 2014 by sreemathi.v

1 answer

In the following compound, identify is it insoluble, partially soluble and highly soluble in water? Pentanol.

asked Aug 5, 2014 by sreemathi.v

1 answer

In the following compound, identify is it insoluble, partially soluble and highly soluble in water? $CHCl_3$

asked Aug 5, 2014 by sreemathi.v

1 answer

In the following compound, identify is it insoluble, partially soluble and highly soluble in water? Ethylene glycol

asked Aug 5, 2014 by sreemathi.v

1 answer

In the following compound, identify is it insoluble, partially soluble and highly soluble in water? Formic acid

asked Aug 5, 2014 by sreemathi.v

1 answer

In the following compound, identify is it insoluble, partially soluble and highly soluble in water? Toluene

asked Aug 5, 2014 by sreemathi.v

1 answer

In the following compound, identify is it insoluble, partially soluble and highly soluble in water? Phenol

asked Aug 5, 2014 by sreemathi.v

1 answer

Based on solute-solvent interactions, arrange the following in order of increasing solubility in n-octane and explain. Cyclohexane, KCl, $CH_3OH, CH_3CN$.

asked Aug 5, 2014 by sreemathi.v

1 answer

Suggest the most important type of intermolecular attractive interaction in the following pair : acetonitrile ($CH_3CN$) and acetone ($C_3H_6O$).

asked Aug 5, 2014 by sreemathi.v

1 answer

Suggest the most important type of intermolecular attractive interaction in the following pair : methanol and acetone

asked Aug 5, 2014 by sreemathi.v

1 answer

Suggest the most important type of intermolecular attractive interaction in the following pair : $NaClO_4$ and water

asked Aug 5, 2014 by sreemathi.v

1 answer

Suggest the most important type of intermolecular attractive interaction in the following pair : $I_2$ and $CCl_4$

asked Aug 5, 2014 by sreemathi.v

1 answer

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

Write the negation of the statement " There exists a number $x$ such that 0<$x$<1."

asked Aug 4, 2014 by rvidyagovindarajan_1

1 answer

Write the negation of the statement " For every real number $x$, either $x$ is >1 or <1."

asked Aug 4, 2014 by rvidyagovindarajan_1

1 answer

State Henry’s law and mention some important applications?

asked Aug 4, 2014 by sreemathi.v

1 answer

Write the negation of "All cats scratch."

asked Aug 4, 2014 by rvidyagovindarajan_1

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

Page:

1
2
3
4
...
69
next »

Feedback Terms Facebook Twitter About Us

Your payment for is successful.

...