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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
Which salt is most soluble in water? chromium (III) nitrate, silver iodide, barium phosphate, or calcium carbonate.
The molecular formula of glycine (an amino acid) is NH2CH2COOH, the molecular mass is 75.07grams/mole. If 10 glycines are joined together by a dehydration reaction to make a polypeptide, what would the molecular mass of the polypeptide equal.
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what volume of 0.100 m naoh is required to precipitate all of the nickel (II) ion from 150.0 ml of a 0.251 M solution of Ni(NO3)2
The mass spectrum of an organic compound shows the relative abundances of M to be 85.12% and M+1 to be 0.9206%. Assuming the peaks are caused by C-12 and C-13 isotopes
the ha monoprotic acid is dissolved in h2o calculate ka and pka for the acid ha if the equilibrium concentrations of
The size of a diamond is measured in carats. (1 carat=.200 g) The density is 3.51 g/cm3. How many carats is a diamond that measures .
The equilibrium constant for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 = PCl3+Cl2. A vessel is charged with 0.123 mol PCl5. At equilibrium what is the concentration of PCl3
calculate the molarity of a solution of glycerol made by dissolving 34.000 ml glycerol at 15 c in enough water to make
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Propanoic acid, HC3H5O2, ionizes in water. A 0.496 g sample of sodium propanoate, NaC3H5O2 (molar mass: 96.07 g/mole) is added to a 50.0 mL sample of a 0.265 M solution of propanoic acid. Assuming that no change in the volume of the solution occur..
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