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Benzene freezes at 5.45oC. The Kf for benzene is - 5.07 oC/m. What would be the freezing point of a 0.210m solution of octane in benzene?
Exactly 56 grams of sodium sulfate, 51 grams of potassium iodide, and 48 grams of barium perchlorate were dissolved in 500 mL of water. What is the mole fraction of the potassium iodide?
A star of radius 7.8 × 105 km rotates about its axis with a period of 66 days. The star undergoes a supernova explosion, whereby its core collapses into a neutron star of radius 13 km. Estimat
If all ionic substances are completely ionized, the aqueous solution with the? lowest freezing point would be?
Copper and zinc (elements 29 and 30, respectively) appear next to each other on the periodic table. A 5.50 g sample of zinc has a volume of 0.770 mL, while a 5.50 g sample of copper has a volume o
A airplane flies directly away from you. If you perceive its engine sound at 82 % of the emitted frequency, the plane's speed is:
What are the freezing point and boiling point of 0.20 m glycerol in ethanol? What is the freezing point of 2.04 g KBr and 4.84 g glucose in 189 g of water?
Use the density of copper (8.95 g/cm3) and its molar mass (63.55 g/mol) to calculate an approximate atomic radius for copper.
Consider the following data showing the initial rate of a reaction (A------> products) at several different concentrations of A.
Two thin slits are 0.050 mm apart. Monochromatic light of wavelength 634 nm falls on the slits. If there is a screen 6.0 m away, how far apart are adjacent interference fringes?
Calculate the value of n1/N, that is, the ratio of the number of nuclei in the first excited nuclear energy level to the number of of nuclei for a nucleus with e1 - e0 = 1MeV at 25C.
What is the molarity of a 1025 mL ethanol/sugar solution that has a freezing point of -120.87 deg C. Freezing point of ethanol is -117.3 and has a density of .789 g/mL.
Question: The angular momentum of a spinning wheel is 231 kg · m2/s. After application of a constant braking torque for 2.3 s, it slows and has a new angular momentum of 123 kg · m2/s. W
A transformer connected to a 120-V (rms) ac line is to supply 12. V (rms) to a portable electronic device. The total equivalent resistance of the system is 5.0 Ohm. What should the ratio of primary
What is the freezing depression if .25 moles of sodium chloride was dissolved in 350ml of water?
If the vial weights 185.56 g when filled with liquid mercury (d=13.53 g/cm^3), what is its volume? How much would the vial weight if it were filled with water (d=0.997 g/cm^3 at 25 C)?
What is the total energy, in kJ, needed to raise 20 g of CH4O (methanol) from - 120 °C to 100 °C? Show your work.
Assuming each quadrant of the pizza to be the same, find the center of mass of the uneaten pizza above the axis (that is, the portion of the pizza in the second quadrant). Find the -coordinate.
or a certain reaction, kc=2.2*10^_4 and kf=0.284 M^-2 *s^-1. Calculate the value of the reverse rate constant, kf, given that the reverse reaction is of the same molecularity as the forward reactio
A solution is prepared by diluting 225 mL of 0.1885 M aluminum sulfate solution with water to a final volume of 1.450 L. Calculate the number of moles of aluminum sulfate before dilution.
How do I calculate the volume of dry hydrogen gas would occupy at STP. (use the combined gas law). The mass of pure magnesium is 0.030g
What is the maximum weight that a single thread of this silk could support?
Using Half Reactions, Write a balanced Oxidation-Recuction reaction. Oxidation of 1 to 12, and reduction of Mn02 to mn2+
Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2. By what factor does the rate change if the concentration of BrO3- is tripled and that of Br- is is decreased by a factor of 3? Jus
A person pulls a toboggan for a distance of 34.8 m along the snow with a rope directed 32.2 degrees; above the snow. The tension in the rope is 91.5 N. (a) How much work is done on the toboggan by t