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A covalent compound is composed of a phosphorus atom and three bromine atoms.
a. How many valence electrons does the compound contain?
b. Draw the Lewis structure for this compound in the space below.
Determine the thickness needed to reduce the intensity of a beam of gamma rays to 1/4th of its initial intensity (in g/cm^2, in cm) for a 300 keV gamma ray in Al, and in Pb.
Describe all the symmetry planes in the staggered conformation of ethane. Draw a figure and arrows to show any rotational symmetry axes in the staggered conformation of ethane.
Explain the acronyms mks, SI, and cgs. What are the metric prefixes for million and millionth? What are the four most common metric prefixes? Which is larger, a liter or a quart? What is the standard unit of volume in the SI?
at 80 degrees celsius the vapor pressures of pure liquids X,Y and Z are 385, 190,and 66 mm Hg, respectively. What pressure must be exerted on the surface of a solution containing one mole of X, three mole of Y, and two moles of Z for boiling to be..
The following name is wrong. Identify the functional group then draw the structure based on the incorrect name and fix the name: 2-methyl-1,3-diethyl-5-pentyne.
Explain what is the chemical formula of the diatomic molecule in which 0.314 moles of the substance has a mass of 22.26 grams
An electrochemical cell has an Eocell of 1.70 V and transfers 2 moles of electrons. The Faraday constant is 96,485 C/mol e-. What is the value of delta G
Under constant pressure conditions, a sample of hydrogen gas initially at 88.0 degree C and 9.50 L is cooled until its final volume is 3.00L. what is its final temperature
2,2-dibromo-3-methylpentane can be prepared by an addition reaction of excess HBr with an alkyne. Draw the structure of the alkyne, name it, and write the reaction
What volume of the stock solution (Part A) would contain the number of moles present in the diluted solution (Part B)? but I cant get this one right can someome please help.
You found that pH=pKa=4.2 when 12.50 mL of NaOH hadbeen added. The concentration of the sodium hydroxide was 0.500M. Calculate the initial percent dissociation of the acidsample.
Calculate how much energy in the form of heat is available from 100mL of this mixture and compare it with the amount available from pure gasoline
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