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At 25 degrees celsius at 0.50 g sample of polyisobutylene (a polymer used in synthetic rubber) in 100.0 ml of benzene solution has an osmotic pressure that supports a 5.1mm column of solution (d = 0.88 g/mL).What is the molar mass of the polyisobutylene? (For Hg d=13.6 g/ml)
95.0mL of rm H_2O is initially at room temperature (22.0rm{} ^{circ}C). A chilled steel rod at 2.0rm ^{circ}C is placed in the water. If the final temperature of the system is 21.4^{circ}C.
What is ozone and how it works as a protective molecule for our environment? What are the effects of CFCs on the ozone layer.
What is the E°cell for the cell represented by the combination of the following half-reactions
a sample of KHC2O4 weighing 0.717g was dissolved in water and titrated with 23.47 mL of an NaOH solution. caluculate the molarity of the NaOH solution.
filtrate be used to transfer the residue when the desired product is solid
calculated was contained in 23.80 mL of KMnO4 solution. calculate the molarity of the KMnO4 solution.
a helium balloon is held at 1.2 atm of pressure and 300 K. If the pressure on the balloon increases to 4.2 atm, to what temperature must the balloon be heated , to maintain its same volume?
Using the periodic table, arrange the atoms in each of the following sets in order of increasing electronegativity: a) CL, F, Br; b) B, O, N; c) Mg, F, S
Assuming that acetic acid (HC2H3O2) has one acidic H and is the only acid in vinegar; calculate the concentration of HC2H3O2 in this sample. (Ka=1.8e-5)
Determine the energies of ten lowest energy levels for this system.
Calculate the molar solubility and the solubility of iron (II) hydroxide in pure water then in 0.125M NaOH(aq).
If given Cu(OH)2=CuO + ? and separately CuO + HCl= CuCl2 + ? What are the finished equations?
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