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When a 41.7g sample of an unknown compound is dissolved in 500g of benzene, the freezing point of the resulting solution is 3.77oC. The freezing point of pure benzene is 5.48oC, and Kf for benzene is 5.12oC/m. Calculate the molar mass of the unknown compound.
how do the densities of metals can be calculated? could this method be used for determining the density of mercury as
the following changes in a DNA molecule may have no effect on the protein for which the DNA codes
Calculating percent purity from a reaction, One of the reactions that occurs in a blast furnace, where iron ore is converted to cast iron is Fe2O3 + CO = Fe + CO2.
Model symmetry, Construct a model* in which a tetrahedral (sp 3) carbon atom (black) has four different model atoms attached to it. Use the light blue ball, red, blue
Diphosphorus pentoxide is added to water Hydrogen sulfide gas is bubbled through a solution of silver nitrate.
The native conformation of a protein represents the lowest energy state of the polypeptide. Would you expect it to be always true
Given the following at 25°C and 1.00 atm: 1/2N2(g) + O2(g) ® NO2(g)DH0 = 33.2 kJ N2(g) + 2O2(g) ® N2O4(g)DH0 = 11.1 kJ Calculate the DH0 for the reaction below at 25°C. 2NO2(g) ® N2O4(g)
Given the energy of a diatomic molecule with masses m1 and m2 constrained to move along the x axis. The force constant of the bond connecting the two atoms is k.
A 21.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter, according to the following reaction. If the temperature rises from 25.0°C to 62.3°C, determine the heat capacity of the calorimeter. The molar mass of ethanol is 46.07 g/mol.
If a 0.135g sample of NaCl were placed on an ion-exchange column in the H+ form and the eluate titrated with 0.1231 M NaOH, what volume of the NaOH solution would be required to reach a phenolpthalein end point
For carbon tetrachloride, the boiling point constant is 5.03°C·kg/mol, and the boiling point of pure carbon tetrachloride is 76.50°C.
At 298K, the osmotic pressure of a glucose solution is 10.50 atm. Calculate the freezing point of the solution if the density is 1.16g/mL
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