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1. Urea has a mass percent composition of 20% C, 6.71% H, 46.65% N, and 26.64% O. A solution prepared by dissolving 1.62 g of urea in 100 g of water freezes at -0.5 degrees C. What is the molecular formula of urea? Kf for water = 1.86 degrees C/m.
2. An aqueous solution is prepared by dissolving a non-volatile solute C2H6O2 in 100 g water. What would be the boiling point, freezing point, and osmotic pressure of this solution if it has a vapor pressure of 20.5 torr at 25 degrees C? The vapor pressure of water at 25 degrees C is 23.78 torr. The density of the solution is 1.15 g/mL.
A solution of barium nitrate contains 6.12 g per liter of solution. How many grams of barium nitrate is contained
The mass of the flask (before the sample is placed into the flask) is measured when the outside of the flask is wet. However, the outside of the flask is dried before its mass is measured.
Explain whether the molecular structure of aspirin is likely to result in it being addictive? I'm comparing the structure to methylamphetamine
A vessel which is 5 m^3 is filled with propylene. The pressure inside the vessel is 470 psi, and the temperature of the vessel is 25 C. A) How many kg of propylene are in the vessel?
What is the molarity of a solution that contains 41.0 g of vitamin B1 hydrochloride (molar mass = 337 g/mol}) in 280 mL of solution?
a problem frequently encountered in the dehydration of alcohols is the rearrangement to form a more stable carbocation. Explain why this is not a problem in the synthesis of cyclohexene
the volume of 4 cubic meters of gas is kept under constant pressure. its tempeture is increased from a minus 73 degrees celsius to 127 degrees celsius. What is the new volume of the gas?
what was your sampling rate to the nearest 1 ml/min over a four hour sample period if you collected 35 mg of carbon tetrachloride from a known concentration of 150 PPM?
Calculate the equilibrium concentrations of I2, Cl2, and ICl. (Kc = 0.110 at this temperature.)
When heated, lithium reacts with nitrogen to form lithium nitride: 6Li (s) + N2 (s) ----> 2LiN 9s) If 12.3 g of Li are heated with 33.6 g of N2: a) Determine the limiting reactant b) What is the theoretical yield of the reaction
how many molecules of carbon dioxide are produced when 134 molecules of acetylene hcch to react in excess oxygen
Assume that aspartame is a molecular solid and does not ionize when it dissolves in water. Kf values are given here.
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