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A gas of unknown molecular mass was allowed to effuse through a small opening under constant-pressure conditions. It required 105 s for 1.0 L of the gas to effuse. Under identical experimental conditions it required 31 s for 1.0 L of O2 gas to effuse. Calculate the molar mass of the unknown gas.
When light of frequency 6.88×1015 s-1 shines on the surface of a metal, electrons are ejected with a maximum kinetic energy of 3.40×10-19 J. Calculate the wavelength of this light.
A solution of HCl in water conducts an electric current , but a solution of HCl in hexane does not. explain this behavior in terms of ionization and chemical bonding
mt. kilimanjaro in tanzania is the tallest peak in africa 19340 ft.. on a particular day the barometric pressure at the
student takes 116. g of BaCl2, and reacts it according to the following equation: 3BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3 How many moles of AlCl3 are formed?
Predict the products of their eliminations, and explain the large difference in the ease of elimination.
In the lab you make 10-5.5 M solutions of HCl and of NaOH using pure distilled deionized water. What would be the pH after the solutions equilibrate with the atmosphere
What molecules are used and why are they colored. and how does the different composition depend on the specific ink color also, how do different components absorb different wavelengths of light in the ink
The combustion of one mole of ethanol (C2H5OH(l)) to produce carbon dioxide and gaseous water has ?Hr = -1235 kJ · mol-1 at 298 K. What is the change in internal energy for this reaction?
a solution contains 55 grams of ascorbic acid in 250 g of water freezes at -2.34 degrees C. calculate the molar mass of the solute
Complexes of a given metal with ligands higher in the spectrochemical series like CN- will display _______ crystal-field splitting and will absorb light towards the ____ end of the spectrum.
Describe a simple and practical way to make 1.00L of this buffer solution, assuming 1.0 M solution of the molecular base is available and that the chloride salt of the conjugate acid is available as a SOLID.
a silver chloride precipitate weighing 0.2255 grams was obtained from 0.3448 grams of a soluble salt mixture. calculate
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