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.799 g sample of an unknown substance has dissolved in 15.6 g of benzene. The freezing point of the solution was 4.075 C. The freezing point of pure benzene is 5.455 C. For benzene, Kf= 5.065 C/m, and Kb=2.61 C/m. Assume that the solute is a nonelectrolyte.
What is the molality of the solution?
A sample of an unknown gas effuses in 10.5 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.07 min. What is the molar mass of the unknown gas?
Either bulb will be used for 2,000 hours per year at an electricity cost of $0.14/kwh (kilowatt-hour). If the interest rate is 6%, which bulb is more cost effective over 8,000 hours of use based upon a comparision of Net Present Values?
What mass of sucrose should be combined with 468 of water to make a solution with an osmotic pressure of 8.75 at 295 ? (Assume the density of the solution to be equal to the density of the solvent.)
Determine the maximum number of electrons that could be emitted from metal by a burst of light with a total energy (E)of 9.86× 10^(-7) Joules?
A flask is charged with 0.140 mol of A and allowed to react to form B according to the following hypothetical gas-phase reaction. A(g) B(g) The following data are collected. times (s) 0 40 80 120 160 moles of A 0.140 0.068 0.049 0.031 0.019 (a)
How many moles of Na2SO3 were added to the calorimeter cup if 40.0mL 0.50 M NaOCl and 60.0mL 0.50 M Na2SO3 were combined?
What is the volume of 290. mL of oxygen gas at 112°C and 790. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.
octane has a density of 0.692g/ml at 20C. How many grams of O2 are required to burn 30.5 gal of C8H18
Suppose 10.0 g of CH4 is used in a reaction that can theoretically produce 95.8 g of CCl4. What is the percent yield of CCl4 if the reaction produces only 80.0 g of CCl4.
How many grams of F2 are needed to produce 120. g of PF3 if the reaction has a 78.1% yield?
Limestone (CaCO3) is used to remove acidic pollutants from smokestack flue gases. It is heated to form lime (CaO), which reacts with sulfur dioxide to form calcium sulfite
The decomposition of nitrogen dioxide is a second-order reaction. At 550 K, a 0.250 M sample decomposes at the rate of 1.17 mol/Lxmin a). Write the rate expression?
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