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Para-amino benzoic acid, PABA, HC7H6NO2 is used in some sunscreen agents. A solution is made by dissolving .263 mol of PABA in enough water to make 750mL of solution. The solution has [H+]=2.6E-3 M. Explain what is the Ka for PABA?
What is the percent purity of NaHCO3 in your baking soda? (The formula weight of NaHCO3 is 84.007 g/mole).
Which choice correctly describes the electron pairs in the valence shell of the central atom in a molecule of Cl2O?
What does ozone do that oxygen (or any other molecule) do? How? Ozone is created in what is believed to be a two-step process. It is destroyed naturally in one of two pathways. What are those reactions? On Your Own: What is the role of UV in the d..
A 1.17 g sample of an alkane hydrocarbon gas occupies a volume of 674 mL at 28°C and 741 mmHg. Alkanes are known to have the general formula CnH2n+2.
The pressure of gas in a 600.0 ml cylinder is 65.0 mmHg. what volume must it be compressed to increase the pressure to 385mmHg
Show by explicit integration that the 1s and 3s wave functions of the hydrogen atom are orthogonal. Note that in integrals over r
The Goodyear blimps, which frequently fly over sporting events, hold approximately 1.60×105 ft^3 of helium. If the gas is at 25deg C and 1.0 atm, what mass of helium is in the blimp
What would be the change in pressure in a sealed 10.0 L vessel due to the formation of N2 gas when 32.0 g of NH4NO2 decomposes at 25 degrees C
construct a lewis structure for hydrogen peroxideh2o2 in which each atom achieves an octet of electrons.do you expect
Phenol (C6H5OH, also called carbolic acid) has a pKa of 9.89. It is used to preserve body tissues and is quite toxic. Calculate the percent ionized in 0.0503 M phenol--a dilute solution.
calculate the energy of a photon of that radio wave. If you then hit the surface of a metal that has an ionization potential of 2.1 x 10-26 J, would you have enough energy to kick off an electron from the surface. If yes, what would be the velocit..
the excess I3- was titrated with 50.00 ml of a 0.02000 M Na2S2O3 solution. What was the mass percent of arsenic trichloride in the original sample?
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