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Consider the following generic chemical equation: 2A + 5B ➡️ C + 3D. If you react 4 units A with 10 units of B, which statement is true?
Quinine (a non-volatile, non electrolyte) has the empirical formula C10H12NO.A sample of
quinine (0.162 g) was mixed with camphor (10.0 g) and the freezing point of the mixture was found to be 175.2 oC. The freezing point of pure camphor was determined to be 177.2 oC.
[Kf (camphor) = 40.0 oC Kg mol-1]
(a) Calculate the freezing point depression of the solution.
(b) Calculate the molality of the quinine.
(c) Calculate the moles of quinine.
(d) Calculate the molar mass of quinine
(e) What is the molecular formula of quinine?
How many liters of solution are needed to make a 1.66M solution containing 2.11 moles of potassium permanganate
At 200 °C, the concentrations of nitrogen, hydrogen, and ammonia at equilibrium are
measured and found to be [N2] = 2.12 M, [H2] = 1.75 M, and [NH3] = 84.3 M. Calculate
the equilibrium constant at the temperature given.
Why you should never heat a volumetric flask or add hot solution to it
in the sun hyrdogen atoms undergo nuclear fusion to produce Helim and -1.7 x 10^9 kj/mol of He how much energy can be obtained from 1.00 kg of helium
Canadian (CANDU) nuclear reactors produce energy by nuclear fission of uranium-235.
in + 235U → Kr + 14Ba + 3 in
If the molar enthalpy of fission for uranium-235 is -1.9 x1010 kJ/mol, how much energy can be obtained from the fission of 1.00 kg of pure uranium-235?
A sample of bauxite ore contains 7.71 x 1024 molecules of aluminum
oxide, Al20g. How many moles of aluminum oxide are in the sample?
What is the molar mass of magnesium
An unknown fraction of organic matter in soil has a molecular mass of 2200 g/mol. It contains 20 carboxyl groups (pka = 5) and 10 phenolic groups (pka = 6). The pH of this soil is 5. What is its CEC? Write a sentence describing how functional groups relate to charge generation in soil.
