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To what general class of mechanisms does the attack of bromide ion, Br-, on the cyclic bromonium ion 50 (bridged bomonium intermediate of E-stilbene) belong?
Naturally occurring oxygen is composed of 99.757% of 16O (atomic mass, 15.9949 u), 0.038% of 17O (atomic mass, 16.9991 u), and 0.205% of 18O (atomic mass, 17.9992.
Chromium is a metal used in making various steels. A rectangular bar of this metal measuring 1.75 cm 2.18 cm 2.28 cm was found to have a mass of 62.1 g. What is the density of chromium?
A 90.0mL sample of 1.00M NaOH is mixed with 45.0mL of 1.00M H2SO4 in a large Styrofoam coffee cup; the cup is fitted with a lib through which passes a calibrated thermometer.
An insulated container is used to hold 45.60g of water at 39.70 degrees Celcius. A sample of copper weighing 8.50g is placed in a dry test tube and heated for 30 minutes in a boiling water bath at 1
Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only C, H, and O. Combustion of 19.81 mg terephthalic acid produces 41.98 mg CO2 and 6.
Which reactant is limiting?C6H5Cl or C2HOCl3 Which is in excess?C6H5Cl or C2HOCl3 . What mass of the excess reactant is left over (in grams)
Benzene, C6H6, and toluene, C6H5CH3, form ideal solutions. At 35°C the vapor pressure of benzene is 160. torr and that of toluene is 50.0 torr.
An electrochemical cell is constructed at 25 C as follows. One half cell Zn2+/Zn cell, that is, a strip of zinc immersed in a 1.00 M Zn 2+ solution.
An ideal solution is formed from a mixture of the nonvolatile solute urea, CO(NH2)2, and methanol, CH3OH. The vapor pressure of pure methanol at 20°C is 89 mmHg.
When 0.981 g of tartaric acid is dissolved in 11.23g of water, the solution freezes at -1.26 C. Find the empirical and molecular formulas of tartaric acid.
Analysis shows that the compound is 53.31 mass % C and 11.18 mass % H, the remainder being O. Calculate the empirical and molecular formulas of the compound.
An ore of barium contains BaCO3. A 1.224 g sample of the ore was treated with HCl to dissolve the BaCO3. The resulting solution was filtered to remove insoluble material and then treated with H2SO4
Lysozyme is an enzyme that breaks bacterial cell walls. A solution containing .150 g of the enzyme in 210 mL of solution has an osmotic pressure of .953 torr at 25 degrees Celcius. What is the mola
Strontium phosphate is also insoluble in water. knowing calcium phosphate is insoluble, why is it not surprising that strontium phosphate is also insoluble?
Toluene, C7H8, is used in the manufacture of explosives such as TNT (trinitrotoluene). A 1.500 g sample of liquid toluene was placed in a bomb calorimeter along with excess oxygen.
A compound containing sulfur, nitrogen, and hydrogen has 86.6% sulfur, 12.6% nitrogen, and 0.91% hydrogen. A 1.263-g sample of this compound was dissolved in 25.00 g of bromoform, producing a soluti
A helium balloon with a volume of 410 mm is cooled from 48 deg celsius to -37 deg, the pressure on the gas is reduced from 110 kpa to 91 kpa what is the volume of the gas at the lower temp and pres
When 10.0 g KOH is dissolved in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 25.18 °C to 47.53 °C. What is the enthalpy change per gram of KOH dissolved in the wa
If the balloon is filled with 2.4 L of helium at sea level, is released and rises to an altitude at which the atmospheric pressure is only 504 mm Hg, will the balloon burst?
Calculate the pH of a buffer prepared by mixing 50.0 mL of 1.00 M ammonia and 50.0 mL of 1.00 M ammonium nitrate (Remember to take dilution into account)
A compound of phosphorus and chlorine used in the manufacture of a flame retardant treatment for fabrics contains 1.20 grams of phosphorus for every 4.12 g. of chlorine.
A 7.58 gram sample of benzoic acid, C6H5CO2H, is dissolved in 100 ml of benzene. The density of benzene is .879 g/ml. What is the molality of the benzoic acid?
What is the hydronium-ion concentration of a buffer solution that is .25 M Na2HPO4 and .40 M NaH2PO4? For H3PO4, (Ka1=6.9x10-3), (Ka2=6.2x10-8) and (Ka3=4.8x10-13).