ASSIGNMENT #1
1. What is
the molarity of HNO3 in concentrated nitric acid , a solution with a
density of 1.42g /cm3 that
contains 68.0% HNO3 by mass?
2. The
antifreeze in most automobile radiators is a mixture of equal volumes of
ethylene glycol and water with minor amount of other additives that prevent
corrosion . What is the molarity of ethylene glycol in a solution prepared from
2218 g of ethylene glycol and 1996 g of water
3. At 25 0C ,25 g of
glycine the simplest amino acid found in proteins, will dissolve in exactly 100
g of water .Calculate the mole fraction of glycine and water in solution.
4. Calculate
the mole fraction of solute and solvent in a 3.00 molal solution of sodium
chloride .
5. A
sulphuric acid solution containing 2.001 g of sulphuric acid in 0.350 liter of
solution at 20 0C has
density of 1.3294 g/ml . Calculate (a) the molarity , (b) the molality, (c) the
percent by mass of Sulphuric acid and (d) the mole fraction of sulphuric acid .
6. Assume
the solution is the ideal and determine the vapour pressure of a solution of
92.1 g of glycerin in 184.4 g of ethanol at 40 oC . The vapour pressure of
pure ethanol is 0.178 atm at 40 oC. The
glycerin is essentially non volatile at this temperature
7. Find the
Freezing point of a solution of 92.1 g of iodine , in 800g of
Chloroform, assuming that the iodine nonvolatile at that the solution is an
ideal. Kf of chloroform is 4.68 oC/mol/kg
an freezing point is -63.5 oC
8. Find the
boiling point of a solution of 92.1 g of iodine , in 800g of
Chloroform, assuming that the iodine nonvolatile at that the solution is an
ideal. Kb of chloroform is 3.63 oC/mol/kg
an Boiling point is 61.26 oC
Reference : Table 12.1 of General Chemistry
By Robinson-Odom-Holtzclaw(10th Edition)
Solvent
|
Boiling point(oC)
|
kb
oC. mol.kg-1
|
Freezing point
|
kf
oC mol.kg-1
|
Water
|
100.00
|
0.512
|
0.00
|
1.86
|
Acetic Acid
|
118.1
|
3.07
|
16.6
|
3.9
|
Benzene
|
80.1
|
2.53
|
5.5
|
5.12
|
Chloroform
|
61.26
|
3.63
|
-63.5
|
4.68
|
Nitrobenzene
|
210.9
|
5.24
|
5.67
|
8.1
|
ASSIGNMENT #2
Topoic: Percent,
ppm and ppb
1) Calculate the
concentration of salt in a solution of water in percent if 45 grams is
dissolved in 1,200 ml of water.
2) Calculate the mass of
solute in a 10% salt solution if the mass of the solvent is 350 grams.
3) Calculate the mass of
solvent in a 6 ppm solution of a drug if the mass of the solute is 0.050
milligrams.
4) What is the
concentration in ppm of selenium if 1.3 milligrams is found in 2,500 kg of
soil?
5) What is the
concentration in ppb of PCB's in a chemical spill, if their is 0.060 mg in
4,600 Kg of soil?
6) Calculate the mass of
solute of hydrogen peroxide in a 35 % solution if 450 ml of solution is being
used.
7) Calculate the mass of
solute PCB's in a 65 Kg person, if the concentration is 4 PPM?
8) What mass of nickel
is in a 2.4 Kg sample of propanol if the concentration is 20 ppb?
9) Calculate the mass of
solvent that would contain 3.0 mg of a drug if the concentration was 3.5%.
10) Calculate the
concentration in ppm if 8 grams of CaCl2 is dissolved in 250 ml
of water.
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