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A 4.15g piece of calcium is dropped into 250.0ml of 0.600 M HCl. What is the concentration of magnesium chloride? What is the mass of hydrogen present?
Calculate the molality H3PO4 in the solution and Water is the solvent and the molarity of H3PO4 in the solution and the number of ml of the 85% H3PO4 that is required to make 800 ml of 2.00 M H3PO
Each tire on a car has a radius of 0.330 m and is rotating with an angular speed of 15.5 revolutions/s. Find the linear speed v of the car, assuming that the tires are not slipping against the groun
What is the concentration of 0.44% Ba(OH)2 in terms of normality? How many milliliters of 22% w/v Na2SO4 would be required to prepare 500ml of a 0.5 N Na2SO4 solution?
Calculate the mole fraction of benzene in a solution of benzene and toluene that has a total vapor pressure of 266mmHg at 60 degrees C.
Toluene, C6H5CH3, is a liquid used in the manufacture of TNT. Its normal boiling point is 111.0oC and its molar heat of vaporization is 35.9 kJ/mol. What would be the vapor pressure (in torr) of tol
The diameter of a neutral helium atom is about 1.0 102 pm. Suppose that we could line up helium atoms side by side in contact with one another. Approximately how many helium atoms would it take to
What will be the final temperature. The specific heats of ice and water are 2.09 and 4.184 J/g.°C, respectively. The heat of fusion for water is 334 J/g.
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.