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Traces of toxic, man-made hexachlorohexanes in North Sea sediments were extracted by a known process and by a new procedure, and measured by chromatography. Is the mean concentration found by procedure A significantly different from that of the conventional procedure?
Method Concentration Found (pg/g) Standard Dev.(pg/g) Number of replications Conventional 34.4 3.6 6Procedure A 42.9 1.2 6
Calculate approximately the heat released when you are given a chemical equation as 2-methyl-1-propene CH 3 ) 2 C CH 2 reacts
A certain solvent has a normal freezing point of 1.72 ° C, and a freezing point depression constant of 5.07 ° C/m. What is the molality of a solution in
calculate the mass of hydrogen gas that could have been produced. What would the gas volume be at room temperature and one atmosphere of pressure.
crystallizes in a body-centered cubic array of atoms in which the length of the unit cell's edge is 569.7 pm (10-12 m). Calculate the density of the metal in g/cm3.
A solution is prepared from 4.5729g of magnesium chloride and 43.244g of water. The vapor pressure of water above this solution is found to be 0.3628atm at 348.0 K. The vapor pressure of pure water at this temperature is 0.3804 atm.
A solvent for an industrial process requires the use of phenol or benzene. Both are about the same in effectiveness for the process, and of course, gloves will be used when handling either solvent
Determine what would the pressure be if the volume of this sample gas is decreased to 5.38 Litre also state that which law of gas is used in this process?
If the heated copper is then placed into the water in the insulated container, given that the specific heat of copper is 0.385J/(gC), calculate the maximum temperature of the water after the copper metal is added.
Calculate the percent yield for a student who completed experiment 27A and collected the following data. Give your answer to two decimal places.
What volume of O2 at 684mmHg and 37degree celsius is required to synthesize 22.0 mole of NO2.
chromium metal reacts with 3.807 g of iodine. Using the conservation of mass law, predict the mass of product.
The ball is used on the driveway at temperature of -7 degree C and feels flat. What is the actual pressure of the air in the ball ? What is the gauge pressure?
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