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Camphor (C10H16O) melts at 178.4 degrees C and has Kf=37.7 K/m. A sample of unknown substance that weighs .840g lowers the freezing point of 25g of camphor to 170.8 degrees C. What is the molar mass of unknown substance? Assume unknown solute does not dissociate in solution.
The concentration of iodine in sea water is 60. parts per billion by mass. If one assumes that the iodine exists in the form of iodide anions, what is the molarity in sea water
What mass in grams of tryptophan is in 0.25 quart of milk, assuming tryptophan accounts for 2.0% of milk by mass and that the density of milk is 1.04 kg/L.
A single strand of natural silk may be as long as 4.03 x 10^3 m. Convert this length into miles.
Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition
The following molecular equation represents the reaction that occurs when aqueous solutions of silver nitrate and aluminum chloride are combined.
What volumes of COsub2 and NHsub3 a 200. atm and 450. degree C are needed to produce 2.50kg of urea, assuming the reaction goes to completion
the change in energy of each system and also of the composite system. the change in entropy of each system an also of the composite system.
An equilibrium mixture contains N2O4 , (P= 0.27 ) and NO2 (P= 1.0 ) at 350 K . The volume of the container is doubled at constant temperature.
pure nitrogen can be prepared when an aqueous solution of ammonium nitrite decomposes to form water vapor and nitrogen gas. How many grams of ammonium nitrate must have reacted if 3.75dm3 of nitrogen gas was collected over water at 26C and 97.8 kP..
What base is routinely used to clean up an acid spill. Why is it necessary to immediately clean the test tube which contains the silver mirror formed during the Tollen's Test
NH3 is a weak base (Kb = 1.8 × 10-5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.049 M in NH4Cl
Do not delete any of the atoms or bonds in the ring or directly attached to the ring with the Erase button, and do not move atoms or groups directly attached to the ring by dragging them.
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