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For a reaction which has the temp of 298K, Delta G is positive and Delta S is 9.0 J/mol-K. What can be said about the limiting value for Delta H at 298? what is the low temperature limit for the sam
Determine the electron-domain geometry of OSF4. Draw two possible molecular geometries for the molecule based on this electron-domain geometry
A sample of an unknown liquid is vaporized in a flask having a volume of 152.1 ml and open to the atmosphere through a pin hole. On a day when the atmospheric pressure is 756.2 torr, the sample is v
When a student performs an experiment using this method, he notices when he removes the flask with the sample from the boiling water bath that a liquid appears in the flask.
At room temp a significant portion of our sample is vaporized, so that when the condensed vapor is weighed, the flask contains sample plus air. The "empty" flask contained only air.
If the experiment is repeated at the same temp but greater pressure, would the required mass be greater than, less than, or equal to the amount previously calculated? Explain.
Calculate the energy values and degeneracies of the lowest three energy levels of an electron confined to move in a cubical box of dimensions 1x1x1 nm.
The solubility of KNO3 is 155g per 100g of water at 75C and 38.0g at 25C. What mass of KNO3 will crystallize out of the solution if exactly 100g of its saturated solution at 75C is cooled to 25C?
A solution containing 10 mmol of CO3-- and 5.0 mmol of HCO3- is titrated with 1.0 M HCl. What total volume of HCl must be added to reach the 2nd equivalence point?
What do the terms "activating", "deactivating", "ortho, para-directing" and "meta-directing mean. How do these relate to aniline, the anilinium ion (protonated aniline), and acetanilide?
Fluorine-18 undergoes positron emission with a half-life of 1.1x10^2 minutes. If a patient is given a 248mg dose for a PET scan, how long will it take for the amount of fluorine-18 to drop to 83mg?
Assume that the enthalpy fusion of ice is 6020 J/mol and does not vary appreciably over the temperature range of 270-290 degrees Kelvin.
MIlk of magnesia , Mg(OH)2, is prepared from aqueous solutions of magnesium sulfate and sodium hydroxide. If a solution containing 50.0-g of MgSO4 is added to a solution with 50.0-g of NaOH.
Potash is composed mainly of potassium carbonate. K2CO3. If 1.000-g of potash reacts with sulfuric acid to produce 145 mL of carbon dioxide gas at STP, what is the percentage of potassium carbonate
The Vapor pressure of a solution containing 36 g of calcium phosphate in 45 g benzene was calculated to 18000 Pascals at 40 °C. Calculate the vapor pressure of pure benzene at 40°C.
The reaction between silver nitrate and sodium chloride is found to have heat of reaction of -64 kJ ( Delta H of Rxn= -64 kJ). Write a balanced chemical equation and determine the source of the heat
The equilibrium constant Kp is 158. Analysis shows that the partial preassure of O2 is 0.25 atm at equilibrium. Calculate the pressure of NO and NO2 in the mixture.
Calculate the hydrogen ion concentration in mol/L for each of the following solutions.(a) 2.42, (b) a solution whose pH is 16.00, (c) a solution whose hydroxide concentration is 3.7x 10-9 M
Calculate the pH of a solution prepared by mixing 15.0mL of 10M NaOH and 30.0mL of 10.0M benzoic acid solution.(Benzoic acid is monoprotic; its dissociation constant is 6.5*10^-5)
A solution is made to be 3.8 * 10-2 M in Al3+ and .29 M in NaF. If the Kf for AlF63+ is 7 * 1019, how much aluminum ion remains at equilibrium?
When a suspected drunk driver blows 188 mL of his breath through the fuel-cell breathalyzer, the breathalyzer produces an average of 324 mA of current for 10s.
Calculate the Molar Mass of vitamin C where a solution contains 55.0 g of vitamin C dissolved 25.0 g of water. The solution freezes at -2.34 degrees Celsius.
Suppose you decide to define your own temperature scale using the freezing point (-11.5 C) and boiling point (197.6 C) of ethylene glycol.
The heat of combustion for a sample of coal is 23.0 kJ/g. How many grams of coal must be burned to heat 220.0 g of water from 20 degrees C to 75 C? The specific heat capacity of water is 4.184 J g-1
What is the ground state electron configuration of Mercury, Hg? Is Mercury expected to be paramagnetic or diamagnetic? Explain Why.