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Hydrogen gas at a pressure of 1.25 bar is contained in a thick-walled neoprene rubber sphere which has inner and outer radii of 70mm and 80mm, respectively. The concentration of hydrogen at the outer surface of the sphere is negligible and leakage is so small that steady-state conditions can be assumed to occur for a long time. The solubility of hydrogen in rubber is 2.37 x 10-3 kmolm -3 (bar)-1 and the diffusivity is 1.8 x 10 -10 m2 s-1. Calculate the rate at which hydrogen escapes fromthe sphere. (Assume the inner surface of rubber is saturated with hydrogen).
If 3.140g of ethanol is burned completely in a bomb calorimeter at 298.15 K, the heat produced is 92.82kJ. 1) Calculate delta H_combustion for ethanol at 298.15 K. 2) Calculate delta H_f for ethanol at 298.15 K.
When most Fe^3+ salts are dissolved in dilute nitric acid, the solution is often yellow to orange-yellow in color. Why could you not visually detect these colors in Fe(NO3)3 stock solution
What is the theoretical yield of ammonia in grams that can be prepared from 41.0 g of nitrogen and excess hydrogen
what is the value of equilibrium constant Kp if the total pressure is 11 atm?
Problem- Use the Rydberg equation to calculate the wavelength (in nm) of the photon emitted when an electron in a hydrogen atom undergoes a transition from n= 9 to n=2.
In some cases a Br-Br bond can be broken by the absorption of photons of light energy. Br-Br bond energy is 192 kj/mol determine the photon energy and the wavelength (in nanometers) associated with breaking this bond.
How many kilojoules of thermal energy are released by the reaction of 3.41 g Al with excess oxygen? 2Al(s) + 3/2O2(g) --> Al2O3(s) delta H rnx = -1675.7 kJ
Explain what is the intact compound equation as well as the net ionic equation for the neutralization of aqueous hydrofluoric acid by aqueous calcium hudroxide
The mixture is added to 130g of water. If the solution described in the introduction is cooled to 0 degrees celsius, what mass of KNO3 should be cystallize
Zinc is used to make galvanized iron pipes. these pipes are protected from the rust reactions that would normally occur. Which statement best explains why zinc is used.
Problem- Is it likely that both ring connections are mad simultaneously in this experiment (Miniscale synthesis of a substituted pyrimidine) as was observed for the diels-alder synthesis
Dissolved in water to produce a 0.0170 M solution. The pH of the resulting solution is 2.33. Calculate the Ka for the acid.
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