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1. 1.25g of a compound when dissolved in 15mls of benzene lowers the freezing point of benzene from -6 degrees celsuis to -8.5 degrees celsuis. The Kfp of benzene is -3.5kg/mol degree celsuis. calculate the molar mass of the compound.
a. When 3.5g of salt is dissolved in 50mls of water the freezing point of water is lowered to -1.5 degree celsuis. the Kfp of water is -1.81kg.mole/ degree celsuis. calculate the molar mass of the compound.
b. What would be the number of ions present in a solution of an electrolyte if the freezing point is lowered to -5.1 degree celsuis. given that a non-electrolyte of the same concentration as the electrolyte lowers the freezing point of the same to a temperature of 1.7 degree celsuis.
c. caluculate the molality of a solution if 2.5 grams of sucrose C12H22O11 is dissolved in 25 mls of water. atomic masses in g/mol: C=12.01, H=1.008, O=16.0 density of water = 0.99g/ml
d .calculate the mole fraction of the solute in problem 4.
e. if the boiling point of benzene is 80 C, and the boling point of a solution containing 0.25g of mls of benzene is 81
What mass of lead sulfate is formed in a lead-acid storage battery when 1.41g of Pb undergoes oxidation
Part A- Use Coulomb's law to calculate the ionization energy in kJ/mol of an atom composed of a proton and an electron separated by 278.00 pm . Part-B What wavelength of light would have sufficient energy to ionize the atom
The initial pH is 11.9 2) the volume of added acid required to reach the equivalence point? pH? 3) the pH at 5.0 mL of added acid is 11.35 4) the pH at the equivalence point??? 5) the pH after adding 6.0 mL of acid beyond the equivalence point
How would the calculated molar mass change(increase,decrease,no change) if the following experimental problems were encountered? explain the reason for your answer. (a)the unknown was impure and only part of the unknown dissolved in the lauric aci..
The NO molecule has a double degenerate electronic ground state and a double degenerate excited state at 121.1 cm- 1. Calculate and plot the electronic contribution to the molar heat capacity of the molecule up to 500K
Assuming that all the other quantum numbers can take only the values possible in our world and that the Pauli esclusion principle applies, give the following.
What is the pH of a 0.30 M pyridine solution that has Kb=1.9x10^-9? the equation for the dissociation of pyridine is C5H5N5(aq)+H2O(l) >>> C5H5NH(aq)+OH-(aq).
Calculate the density of a piece of wood that is found to have a mass 2.34 g and is placed in a graduated cyclinder with 34 ml of water, which then rises to 50 ml with the block of wood
S8 also known as orthorhombic sulfur, what type of chemical bonds does S8 have? what type of crystal is this?
What is the formula for corn oil, a triglyceride containing palmitic, oleic and linoleic acids
watch for stereochemical implications. doing the mechanisms would be good practice too. question application of
What molarity of aqueous calcium chloride solution can be expected to show the same conductivity as 0.0050 M aluminum sulfate at 12,500 units.
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