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the density of an aqueous ethanol solution is .789 g/mol. How many grams of ethanol should be mixed with water to make 225mL to make a 4.5% ethanol solution?
the resulting solution exerts an osmotic pressure of 829 torr. what is the molar concentration of the solution? how many moles of solute are in the solution? what is the molar mass of the solute?
2000°C the equilibrium constant for the reaction is Kc = 2.4 103. 2 NO(g) N2(g) + O2(g) If the initial concentration of NO is 0.150 M, what are the equilibrium concentrations of NO, N2, and O2.
When a metal was exposed to light at a frequency of 4.54× 10^15 s-1, electrons were emitted with a kinetic energy of 3.10 × 10^-19 J.
A 20-g mass of argon occupies 15.0 l at a pressure of 25 kpa . find the volume of the argon when the pressure is increased to 530 kpa.
A tank of 10 m3 volume contains an ideal gas (CP=30 J/mol-K) at T=298 K and P=5 bar. If gas from the tank is allowed to flow through a reversible device and exhaust to the atmosphere at P=1 bar.
When 0.800 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 13C is observed.Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL.
what mixing proportion is required for lime stone with 91% CaCO3, and clay with 31% CaCO3 to get a raw mix with a CaCO3 content of 76%.
A 32.65-g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 54.00 mL
You are expected to design a car that works with photovoltaic panels. Assume that the driver is 75kg and the expected speed is 50km/hr.
Find the activity(not the activity coefficient) of the (C3H7)4N+ (tetrapropylammonium) ion in a solution containing 0.005 M (C3H7)4N+Br- plus 0.005 M (CH3)4N+Cl-. The ionic strength will be affected by mixing
What will be the velocity of the escaping electrons under these conditions? What is the de Broglie wavelength of the escaping electrons?
what is the formula used to determine the mass of KClO3 to form a saturated solution in 250g of water at 30 degrees celcius
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