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Why was it reasonable that such a model exists and what evidence was there that it works. why do we no longer believe in it?
A mixture of the compounds magnesium chloride and sodium oxide contains 2.65 g of magnesium and is 82.5 % by mass magnesium chloride. The compound magnesium chloride is 25.5 % by mass magnesium. The compound sodium oxide is 74.2 % by mass sodium. ..
A 2.983 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl aqueous solution. To this solution was added 1.910 grams of KI and 50.00 mL of a 0.00894 M KIO3 solution. The excess I3..
the energy carried away by one mole of potassium is 295KJmol^-1. What is the wavelength of a single photon? What is the color of this light emitted
What is the pH of a solution that is prepared by dissolving 9.81 grams of acetic acid (60.05 g/mol) and 8.68 grams of sodium acetate (82.03 g/mol) in water and diluting to 800 mL.
The alcohol content of hard liquor is normally given in terms of the "proof," which is defined as twice the percentage by volume of ethanol (C2H5OH) present. Calculate the number of grams of alcohol present in 1.00 L of 81-proof gin. The density o..
What is the mole fraction of pentane in a pentane-hexane solution that has a vapour pressure of 308 torr at 25 oC? (At 25 oC the vapour pressure of pure pentane is 511 torr and that of hexane is 150 torr.)
Calculation of Hydrogen Ion Concentration from pH What is the H concentration of a solution with pH of
what is the oxidation number of the specified element in each compound or polyatomic ion: a)C in ZnCO3 b)Fe i Fe(NO3)2 c)Cl in ClF4^- d)S in S2O3^2-
Gaseous ammonia reacts with oxygen gas to produce gaseous nitrogen monoxide and liquid water. If 750 grams of ammonia and 750 grams of oxygen gas were mixed
a sample of nitrogen gas is collected over water at a temperature of 23.0 degrees celcius. what is the pressure of the
Calculate the pH of 2.00L of buffer made u of 1.00 mole of sodium acetate and 1.00 mole acetic acid before and after the addition of 0.10 mole of NaOH. Assume there is no change in volume when NaOH is added
What mass of solid PbCl2(278.10 g/mol) is formed when 200 mL of .125 M Pb2+
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