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Common brass is a copper and zinc alloy containing 37.0% zinc by mass and having a density of 8.48 g/cm3 A fitting composed of common brass has a total volume of 113.0cm3. How many atoms of zinc doe
Calculate the surface area. if the sphere is broken Into eight spheres, each having a volume of 1.25 centimeter cubed, what is the total surface area of the spheres?
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
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?
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
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.
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.
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.
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
Using Half Reactions, Write a balanced Oxidation-Recuction reaction. Oxidation of 1 to 12, and reduction of Mn02 to mn2+