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If the pressure exerted by ozone, O3, in the upper stratosphere is2.28 torr of Hg and the temp is 250k, how many molecules of ozoneare in one liter? (1 mole of any gas contains 6.022 x 10^23molecules)
Write the concentration of cations in mEq/L and total the concentration of cations in the solutions. Repeat for anions.
The reaction of 2,2-dimethyl-1-propanol with HBr is very slow and gives 2-bromo-2-methyl-propane as the major product. Give a mechanistic explanation for these observations
Calculate the molar solubilty of BaCO3 in a 0.10 M solution of Na2CO2 (aq). Ksp (BaCO3) = 8.1 x 10^-9
A 14.0-g sample of ice at -18.0°C is mixed with 122.0 g of water at 87.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
A solution of salt (molar mass 90 g mol -1) in water has a density of 1.29 g/mL. The concentration of the salt is 35% by mass.
A student following the procedure in this experiment prepared three solutions by adding 11.50, 23.00, and 34.50 mL of a 7.60 x 10-2M NaOH solution to 50.00 mL of a .112M solution of a weak acide.
As a chemist for an agricultural products company, you have just developed a new herbicide,"Herbigon," that you think has the potential to kill weeds effectively
A household lightbulb is a blackbody radiator. Many light bulbs use tungsten filaments that are heated by electric current. What temperature is needed so that λmax=550nm?
During the purification and recrystallization of a solid why can't you just remove the solvent by evaporation after filtering and decolorizing
The sedimentation coefficient of a certain DNA in 1M NaCl at 20C was measured by boundary sedimentation at 24,630 rpm. The following data were recorded:
the specific heat of an unknown metal is found to be 0.233 j kg. The law of dulong and petit predicts a molar heat capacity of J/K mol. Use this law to estimate the molar mass of the element.
Calculate the amount of heat required to completely sublime 73.0 g of solid dry ice (CO2 ) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.
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