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Question: Calculate the vapor pressure at 25 degrees C of an aqueous solution that is 5.50% NaCl by mass. The pure vapor pressure of water at this temperature is 23.78 torr.
The half-life of a certain radioactive element is 1250 years. What percent of the atoms remain after 7500 years?
calculate the equilibrium constant for the reaction. b. what is the chemical significance of the value of the equilibrium constant?
An aqueous solution has a vapor pressure of 84.0 at 50 . The vapor pressure of pure water at this temperature is 92.6 . What is the concentration of in mass percent?
determine the mole fraction biphenyl c12h10 in a 0.555m c12h10 solution in c6h6 benzene ?write down the balanced
What is the vapor pressure of a solution which contains 0.550 moles of acetonitrile and 0.350 moles of acetone? Assume the mixture behaves as an ideal solution.
protonated means that the drug is in its acid form (HA) and dissociated means that the drug is in its dissociated form (A-). the pH of the stomach is about 1 or 2. the pH of the blood is about 7.4. given that a drug has a pKa of 4.2.
Which of the following is/are network covalent compounds A. sodium chloride B. diamond C. quartz (silicon dioxide) D. both B & C
How much ozone is used if the following reaction releases 568kJ of energy in the form of heat? Pb(s) + C(s) + O3(g) ---------> PbCO3(s)
Plutonium-239 is a byproduct of the fission reaction used to produce energy in nuclear power reactors. It has a half-life of 24,400 years. A student determines that it will take 97,600 years for the radioactivity of a Pu-239 sample to drop to one-..
If there are 0.640 g of NaCl left in a beaker that originally contained 75.0 mL of saltwater, what must have been the molar concentration of the original solution? The molar mass of NaCl is 58.44 g/mol.
The initial temperature is 298k. The diameter of the cylinder is 0.5m. and the piston height is 1m. a. what is the mass of the weights on the cylinder
a 0.560-g sample of acetic acid is added to enough water to make 50.00ml of solution. calculate h ch3coo- ch3cooh and
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