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Stearic acid has a freezing point of 71.20 C and a Kf of 4.890C/m. A 400.0 g quantity of stearic acid to which 50.0 g of an unknown is added has a freezing point of 68.00C. Calculate the molar mass of the unknown.
In the reaction below, 4.86 atm each of H2 and Cl2 were placed into a 1.00 L flask and allowed to react: H2(g) + Cl2(g) 2 HCl(g) Given that Kc = 89.9, calculate the equilibrium pressure of HCl.
Since most potassium salts and nitrates are soluble in water, PbCrO4 must be the precipitate. The equation for this reaction is: Pb2+ + CrO4 2- -> PbCrO4. Calculate the theoretical yield using the starting quantities of both reactants.
The energy levels the electron can occupy in the Be3+ ion can be calculated using the energy level equation. Calculate the energy in J of the electron when it is in the n= 4.00 level.
What is the buffer component ratio, ([CH3COO-]/[CH3COOH]) of an acetate buffer
The person selling the coin priced it at $200, claiming it was pure gold. Being a well-equipped traveler and a chemist, the professor produced his graduated cylinder and electronic balance. The coin had a mass of 18.82 g and raised the water level..
State the chemical composition of the sterol that is present in high levels in most people who belong to the high-risk group. Distinguish between the 'good' and 'bad' forms of this sterol.
Calculate the change in temperature for 4.50 g of CaCl2 dissolved in 90.0 mL of H20. Assume that the calorimeter absorbs no heat (ie. Ccal=0)
N2O4+ 2 N2H4= 3 N2 + 4 H2O, Determine the limiting reactant and the mass in grams of nitrogen that can be formed from 50.0g N2O4 and 45.0g N2H4. The molar masses are as follows: N2O4=92.02g/mol, N2H4=32.05g/mol.
A certain mixture of He and Ne in a 356-cm3 bulb weighs 0.1480 g and is at 20oC and 748 torr. Find the mass and mole fraction of He present.
the pH of a saturated solution of a metal hydroxide MOH is 9.30. calculate the Ksp for the compound
A concentration of 0.5 ppm by volume SO2 in air is harmful to plant life. What is the percent by volume of this concentration
what volume of vinegar would be needed to react with 18.00 grams of baking soda? Assume the density of vinegar is the same as that of water.
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