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Demonstrate that if 100 mL of a solution of 5.0 g of A in water were extracted with two 25-mL portions of ether, a smaller amount of A would remain in the water
All of the common noble gases are monatomic and low-boiling. Their boiling points in C are: Ne, -245; Ar, -186; Kr, -152; XE, -107. Using the periodic table, predict as best you can the molecular fo
What are the Chemical Properties of Corundum,Aluminium Oxide?
The equilibrium constant for the reaction of bromine with chlorine to form bromine monochloride is 58.0 at a certain temperature.
What are the influence of current economic crisis on student achievement in chemistry.
pure 2-methylpentane is held in a closed container at 150 deg F. Both gas and liquid are presend. What is the pressure in the container?
Ammonia reacts with oxygen according tot he following equation: Calculate the heat (in kJ) associated with the complete reaction of 155g of NH3.
if the empty cylinder has the mass of 94.2g and the cylinder with water has the mass of 138.7 what is the mass of water, volume of water and the density of water.
Calculate the amount of heat needed to boil 92g of ethanol, beginning from a temperature of -69.2 C . Be sure your answer has a unit symbol and the correct number of significant digits.
What amount of Potassium Chloride forms when 5.25 litres of Chloride gas at 0.95 atm and 293 K reacts with17.0 g of Potassium?
At a certain instant the initial rate of the disappearance of oxygen gas is X. What is the value of the appearance of water at the same instant?
A solution of ethanol (C2H5OH) in water is prepared by dissolving 77.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 275.0 mL of solution. What is the molarity of the ethanol in this
A sample of magnesium metal will combust completely in air according the following reaction:
Ultisols are an important soil order in this group of soils. Describe the typical profile of this soil order paying particular attention to features that directly influence soil and water managemen
The rate constant k for a first order reaction is 1.36 * 10 -3 s -1 at 90 degrees Celcius and the activation energy is 78.4 kJ/mol. What is the rate constant for this reaction at 50 degrees Celcius?
A 100 mL sample of the dilute solution was found to contain 0.021 moles of Pb2+. What was the concentration of Pb(ClO3)2 in the original undiluted solution?
A balloon is filled to a volume of 7.0 102 mL at a temperature of 39.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 102 K. What is the final volume of the balloon
Suppose that the microwave radiation has a wavelength of 12 . How many photons are required to heat 275 of coffee from 25.0 to 62.0 ?
What is meant by hydrogenation? please answer in a simple and easy to understand?
Initially, a 1.0 L container is filled with 2.0 mol of NO2. As the system approaches equilibrium, what happens to the rate of reaction of NO2 breaking down?
manganese makes up 1.3 x 10^-4 % by mass of the elements found in a normal healthy body. How many grams of manganese would be found in the body of a person weighing 204 lbs?
If the partial pressure of oxygen drops below 100 mmHg , passengers become drowsy. If this happens, oxygen masks are released. What is the total cabin pressure at which oxygen masks are dropped?
A balloon is filled to a volume of 7.00 times 10^2 mL at a temperature of 20.0 degrees celcius. the balloon is then cooled at constant pressure to a temperature of 1.00 times 10^2 K. what is the fin
How many grams of iron metal do you expect to be produced when 265 grams of an 84.5 percent by mass iron (II) nitrate solution reacts with excess aluminum metal? Show all of the work needed to solve
A gaseous mixture of and contains 37.8 nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 785 ?