Then, using the freezing-point depression constant for solvent (table 1) and equation (3), you will calculate the molecular weight of the unknown solute sample calculation a solution prepared by dissolving 153 g of an unknown compound in 560 g of naphthalene has a freezing point which is 101 o c lower than the freezing point of pure. Lab # 13 – molecular weight determination by freezing point depression you will be asked to estimate the molecular weight of an unknown solute using freezing point depression the solvent used will be paradichlorobenzene (pdb), lab # 13 – molecular weight determination by freezing point depression revised 8/19/2009 2. Molar mass from freezing point depression having some problems understanding the following 7) what would be the effect of each of the following on the calculated molecular weight of the solute a) some cyclohexane evaporated while the freezing points of pure cyclohexane was being measured b) some cyclohexane evaporated after the solute was.
Determination of the molar mass of an unknown solid by freezing point depression goal and overview point depression constant, k f, for cyclohexane the freezing points of these solutions, which will freezing point depression provides a convenient way to determine the molar mass of an unknown.
Lab 7 - determination of the molar mass of an unknown solid by freezing point depression goal and overview in the first part of the lab, a series of solutions will be made in order to determine the freezing point depression constant, k f, for cyclohexanethe freezing points of these solutions, which will contain known amounts of p-dichlorobenzene dissolved in cyclohexane, will be measured. It describes an experiment to determine molecular weight of an unknown compound from a list of known compounds by freezing point depression method.
Determine the molar mass & molecular formula of the compound solution: 1) determine moles of the compound: δt = i k f m 104 °c = (1) (512 °c kg mol-1) (x / 0301 kg) 104 °c = (1701 °c mol-1) (x) x = 006114 mol 2) determine the molar mass: 785 g / 006114 mol = 1284 g/mol 3) determine molecular formula: the weight of c 5 h 4 is 640866.
No cyclohexane was found in the brain of rats exposed to cyclohexane for 2 weeks cyclohexane is known to undergo oxidative metabolism to yield cyclohexanol (major metabolite), cyclohexanone, and possibly other oxidative products (1,2- or 1,4-dihydroxycyclohexane and its corresponding ketone analogs) the alcohol products can form phase 2 conjugates (sulfates and glucuronide.