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The solvent for an organic reaction is prepared by mixing 70.0 mL of acetone (C3H6O) with 73.0 mL of ethyl acetate (C4H8O2). This mixture is stored at 25.0 degrees C. The vapor pressure and the densities for the two pure components at 25.0 degrees C are given. What is the vapor pressure of the stored mixture? Express the vapor pressure numerically in millimeters of mercury.
acetone 230.0 mmHg 0.791 g/mLethyl acetate 95.38 mmHg 0.900 g/mL
Enzyme can react with only a single substrate. Enzyme has a cofactor that promotes the catalytic activity
the osmotic pressure produced by the solution was 0.138 atm . What is the molar mass of the protein(g/mol)?
An environmental chemist needs a carbonate buffer of pH 10.00 to study the effects of acid rain on limestonerich soils. How many grams of Na2CO3 must she add to 1.5 L of freshly prepared 0.20 M NaHCO3 to make the buffer? KA of HCO3- is 4.7 x 10-1..
The enthalpy of vaporization of water at 373 K and 1 bar is 40.7 kJ/mol and the molar heat capacities are 75.3 J/(mol K) for liquid and 33.6 J/(mol K) for gaseous water. Find the enthalpy of vaporization of water at 273 K and 1 bar.
Suppose you have made 1L worth of a mixture of methanol and water, by mixing 3 parts of methanol and 2 parts of water by mass. Assume for simplicity that the volume of the mixture is exactly equal to the sum of the volumes of the ingredients
what is the [OH-] in a solution that has a pOH of 2.70? Use E notation with 3 significant figures.
An unknown metal weighing 13.11 g at a temperature of 81.0*C is placed in a calorimeter containing 25.0 mL of water at a temperature of 25.0*C. The final equilibrium temperature is 30.0*C. What is the specific heat of the metal?
how many moles of copper nitrate are present in 5 ml of 1.20 M copper nitrate? how do you arrive at that answer?
How reliable is the perfect gas law in comparison with the van der Waals equation? Calculate the difference in pressure of 10.00g of CO2 confined to a volume of 100cm3 at 25 degrees Celsius between treating it as a perfect gas and a van der Waals ..
Iron (II) ions catalyze the oxidation of luminol. The intensity of the resulting chemiluminescence has been shown to increase linearly with iron (ii) concentration from 10^-10 to 10^-8 M.
The initial temperature of the calorimeter is 23.0. If 6.30 of is added to the calorimeter, what will be the final temperature of the solution in the calorimeter?
What is the gas pressure (in atm) inside a 1.69-L bulb that contains 0.9-g of Ne at a temperature of 34.1 C? Be sure to report the units as atm.
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