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(a) Given that the molar mass of H3PO4 is 97.994 grams, determine the number of grams of H3PO4 needed to prepare 0.35L of a 1.25M H3PO4 solution. (b) What volume, in Liters, of a 1.25 M H3PO4 solution can be prepared by diluting 50 mL of a 4.5M H3PO4 solution?
In the first 12.0 of the reaction, 1.8×10-2 of is produced in a reaction vessel with a volume of 0.260 . What is the average rate of the reaction over this time interval.
If 100 mL of a solution containing 0.001 g of a compound with a molecular weight of 150 has a measured absorbance in a 1-cm cell of 2.0, what is the compound's molar extinction coefficient?
Water is added to 25.0 mL of a 0.776 M KNO3 solution until the volume of the solution is exactly 500 mL. What is the concentration of the final solution.
from the equation C2H5OH + 3O2 --> 2CO2 + 3H2O, how many mols of ethanol are needed to use up 3.24 mols of oxygen?
Using a table of thermodynamic data calculate, the Delta H degrees for the following reaction (at 25 degrees C).
Given a stock solution of a food dye having a concentration of 1.0 x 10-5 and an absorbance of 0.700. If a new solution is made by diluting exactly 10.0 mL of the solution with exactly 44.4 mL of distilled water, what should the absorbance of the ..
Which of the following will precipitate as chloride salts: Ag+, Pb2+, Ca2+, K+, and Cu2+?
An oxygen molecule is adsorbed onto a small patch of the surface of a catalyst. It's known that the molecule is adsorbed on 1 of 36 possible sites for adsorption
What is the equation for Coulombic force and why is it important in chemistry? 4. What is the charge on the chloride ion and why does it have this charge
a 1.00L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate pH of the solution after the addition of 100.0mL of 1.00M HCl. Ka for HF is 3.5x10^-4
Explain the following given for each statement in determining the sequence of peptide with concise (short) but complete response. you must state the specificity of each statement implication in determining the sequence of octapeptide
Determine the molarity of Ni in the 20.0 mL solution. Determine the mass in grams of Ni in the original sample. Determine the weight percent of Ni in the sample.
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