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Determine the number of cells per milliliter of the original culture when the total number of colonies and the total number dilutions are as follows
plate count Final dilutions viable number in original culture (CFU/ml)37 1:100?88 1:1,000,000?147 10^-5?221 10^-7?
25.0 mL of a calcium chloride solution is added to an excess of aqueous silver nitrate. The resulting precipitate has a mass of 1.25 grams. If the percent yield of this reaction is known to be 85%, calculate the concentration in molarity of the or..
A bottle of wine consists of an 11 weight percent solution of ethanol (C2H5OH) in water. If the bottle of wine is chilled to -20oC, will the solution begin to freeze? Kfp for water is 01.86 oC?m-1
SO2 present in air can be analyzed by titraion with permangante ions, as described in the equation:
How many moles of gas are in a container that is 2.00 L, at 30.0 atm and a temperature of 25.0 C?
What is the equilibrium concentration of SCN if the Kc=400 for the following reaction at equilibrium if the [Fe3+]=2.00E-3 M and FeSCN 2+ = 4.00E-1M
Write a mechanism for the reaction. Include arrows to show electron flow. Number and write out each step individually.
Consider two DNA molecules: one 400 base pairs long, the other 800 base pairs long. Assuming that each is a rigid rod of diameter 25 Å, with a length of 3.4 Å per base pai.
A mixture consisting of 0.130 mol N2, 0.041 mol O2, 0.100 mol CH4, and an unknown amount of CO2 occupies a volume of 8.90 L at 25°C and 1.09 atm pressure. How many moles of CO2 are there in this sample
2-methyl-2-butene and 2-methyl-1-butene with Br2 in CH2Cl2
Using the same assumptions and approximations you used in lab, determine the molar enthalpy change (in kJ/mol) for the reaction below, assuming that CH3CO2H dissociates completely in water.
You add 1.00 g of a solid weak acid to 100 mL of water, then titrate with 0.100 M NaOH solution. The pH at the half equivalence point is 4.22. Which of the acids in the Weak Acid Equilibrium Constant table most likely matches your unknown?
From a purely statistical standpoint -considering only the number of hydrogens on a particular carbon that could be lost from the intermediate carbocation
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