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Rubber balloons filled with helium do not last as long as those filled with nitrogen or air for the reason that the helium leaks out in a day or two through tiny holes in the rubber, while the rate of effusion of nitrogen through the holes is much slower. If a balloon is filled with 48% helium as well as 52% nitrogen (by volume), Explain what is the percentage of He in the gas leaking out through the rubber?
What is the half-life in minutes of a compound if 75.0 percent of a given sample decomposes in 85.0 minutes? Assume first order kinetics
joe is making a 0.0053 molar sulfuric acid h2so4 solution in the lab. how many grams of pure sulfuric acid is needed to
Use the Nernst equation and data from Appendix D to calculate Ecell for each of the following cells. Enter your answer with 3 significant digits. Enter scientific notation as 1.23E4.
A solution is prepared by dissolving 21.9 NaOH in 116.0 water. The NaOH solution has a density of 1.15g/mL. What is the % mm concentration of the NaOh solution What is the molarity (M) of the solution. What is the total volume (mL) of the solution
A flask contains 0.110 mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask.
The resulting solution has an osmotic pressure of 0.605 atm at 25 C. Assuming that the organic compound is a non-electrolyte, what is its molar mass
HxCyOz + NaOH --> xH2O + NaxCyOz If 27.33ml of 0.0973M NaOH were used to titrate 0.328g of pure unknown carboxylic acid, determine the number of reactive H in a single molecule of the carboxylic acid.
Examining the experimental setup, the students finds an air pocket between the stopper at one end of the U-tube and the electrolyte solution inside the tube
an unknown metal m was converted to the sulfatem2so43. a solution of this metalsulfate was treated with excess barium
An element X whose atomic weight is 22.7 is a mixture of two isotopes with atomic masses of 24.1 and 22.5, respectively. Calculate the relative abundance (mole percent) of each isotope in the mixture.
Ethylene, C2H4, and water react under appropriate conditions to give ethanol. The reaction is C2H4(g) + H2O(g) C2H5OH(g) An equilibrium mixture of these gases at a certain temperature
A container (8.65-L ) holds two gases mixture at 31 °C. The partial pressures of gas X and gas Y, respectively, are 0.206 atm and 0.867 atm. If 0.200 mol a third gas is added with no change in temperature or volume determine the total pressure be..
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