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The wastewater solution from a factory containing high levels of salts needs to be diluted before it can be released into the environment. Therefore, two containers of waste solution are separated by a semipermeable membrane and pressure is applied to one container, forcing only water molecules through the membrane and diluting the waste solution in the other container. As dilution continues, higher and higher pressures are needed to counteract the natural tendency for the water molecules to have a net flow back toward the more concentrated solution.What was the applied pressure at the end of this process if the final concentrations of the solutions were 0.051 M and 0.120 M at a temperature of 23 C?
There are limitations to the amount of pressure that can be applied during reverse osmosis because of the physical nature of the membrane. A membrane has been developed that can withstand osmotic pressures,II , of up to 1.52×10^5 torr . Calculate the maximum molar concentration of a solution that can be purified by reverse osmosis using this membrane at 25 C.
what is the enthapy change needed to heat 1 kg of water at 0.4 MPa and 4°C to steam at 150°C and 0.4 MPa? b/ Does a state change from saturated vapor at 230°C to the state 100°C and 0.05 MPa represent an enthalpy increase or decrease?
discuss how to prepare the solution in question A starting from 0.100 M formic acid and 0.150 M sodium formate
Calculate the molarity of a solution made by dissolving 0.850 grams of Na2SO4 in enough water to form exactly 930 mL of solution.
In a gas mixture the partial pressures are nitrogen 425 torr, oxigen 115 torr, and hellium 225 torr. What is the total pressure (atm) exerted by the gas mixture?
What is the complete ionic equation for the reaction of K with H2O. Identify the reducing and oxidizing agents and the oxidation
How many grams of cholesterol are in 230 mL of blood? The concentration of cholesterol (C_27H_46O) in blood is approximately 5.0mM.
The pH at 25 °C of an aqueous solution of the sodium salt of p-cresol (NaC7H7O) is 11.60. Calculate the concentration of C7H7O- in this solution, in moles per liter. Ka for HC7H7O is equal to 6.7E-11.
A gas is allowed to expand at constant temperature from a volume of 2.0L to 11.2 L against an external pressure of 0.750 atm. If the gas absorbs 128 J of heat from the surroundings
The Reaction A->B+C is second order in A. When [A]0=0.100 M, the reaction is 20% complete in 53.7 minutes. calculate the value of the rate constant( in L/min mol)
The effective nuclear charge, Zeff, for a valence electron can be approximated using the "core charge" of the atom, that is, the total charge of the nucleus and the inner (non-valence) electrons.
If 37.4 grams of water decomposes at 297 Kelvin and 1.30 atmospheres, how many liters of oxygen gas can be produced? 2 H2O (l) yields 2 H2 (g) + O2 (g)
Vessel A contains NH3 gas at 80 degrees celcuis and vessel B contains Ne gas at the same temperature. If the average kinetic energy of NH3 is 7.1x10^-21 J/molecules at 70 degrees celcius, calculate the root-mean-square speed of Ne atomes in m/s.
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