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Ozone molecules in the stratosphere absorb much of the harmful radiation from the sun. how many ozone molecules are present in3.00 L of air under the stratospheric ozone conditions of 265 K temperature and 1.01 x 10^-3 atm pressure?
calculate the change in H, change in G and K (at 298) for the production of ozone from oxygen: 3O2(g) goes to 2O2(g) at 30 km above the surface of the earth the temperature is about 230 K and the partial pressure of oxygen is about 1.0 x 10^-3 atm
What is the de Broglie wavelength (in meters) of a mosquito weighing 1.50 mg and flying at 1.34 m/s?
Important information about Identifying unknown substances, Compound A (C7H14O) burned with a yellow, nonsooty flame and did not decolorize a bromine-methylene chloride solution. It did give a positive 2,4-dinitrophenylhydrazine test
A saturated solution of unknown metal hydroxide M(OH)2 has a measured pH of 8.91. Determine the value of Ksp for the compound.
What is the molar weight of the compound. Note: the freezing point depression constant of water is 1.86 oC/m
A 0.8612 g sample of a mixture consisting of NaBr, NaI, and NaNO3 was analyzed by adding AgNO3 to precipitate the Br and I, yielding a 1.0816g mixture of AgBr and AgI.
The concentration of Mg2+ in seawater is 0.052 M. What is the pH when 95% of the magnesium ions will be precipitated as the hydroxide salt. (Ksp, Mg(OH)2 is 8.9 x 10-12).
A solution of ammonia and water contains 2.70×1025 water molecules and 8.50×1024 ammonia molecules. How many total hydrogen atoms are in this solution
A protein has been eluted from a DEAE-cellulose column by washing with a salt-containing solution. Before the protein is subjected to a quantification assay,
What is the [H3O+] and the pH of a buffer that consists of 0.21 M HNO2 and 0.57 M KNO2? (Ka of HNO2 = 7.1*10^-4) Define What is the component concentraion ratio
Draw a detailed mechanism for the formation of 1,4-di-t-butyl-2,5-dimethoxybezene from t-butyl alcohol.
Calculate the concentrations of all species in a 1.66 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1=1.4x10^-2 and Ka2=6.3x10^-8.
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