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If a student received an unknown sample from the instructor and prepared a diluted solution by pipeting 15.00 ml of the sample into a volumetric flask. Subsequent to adding 2 ml of NH3 and diluting to 50.00 ml with deionizer water he read the absorbance for his diluted sample. Utilizing a previously prepared beer's curve he determined the connection of his dilution to be .00256 M. Find out the concentration of the original unknown sample?
Explain how this reaction at equilibrium responds to the addition of heat? Please include any logic for why the reaction is endothermic or exothermic,
Calculate the heats of combustion for the following reactions from the standard enthalpies of formations listed in appendix 3: (a) 2H2(g) + O2(g) = 2H2O(l) (b) 2C2H2(g) + 5O2(g) = 4CO2(g) + 2H2O(l)
The sucrose is being converted to other sugars in a reaction which is first-order with respect to the sucrose concentration. Exactly 30 minutes later, the sucrose concentration has fallen to 0.131 mol/L. Calculate the value of the rate constant in..
Determination number Initial concentration of CLO2, mol/L Initial concentration of OH^-, mol/L Initial rate for formation of CLO3^- mol/L.s 1 1.25 x 10^-2 1.30 x 10^-3 2.33 x 10^-4 2 2.50x10^-2 1.30 x 10^-3 9.34x10^-4 3 2.50x10^-2 2.60 x 10^-3 1.8..
a sample of chloroform is found to contain 11.3 g of carbon 100.2 g of chlorine and 0.95 g of hydrogen. if a second
Hydrogenation of a liquid triacylglycerol converts: a. the ester group to a ketone group, b. the ester group to a carboxylic group
If 19.6 mL of the HCL solution is required to reach the stoichiometric point in the titration, what is the molar concentration of the HCL solution
Calculate q when 15.8 g of ice is cooled from -22.4 degrees Celsius to -71.0 degrees Celsius (C ice = 2.087 J/g*K)
The mass of a cube of iron is 338 g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead that has the same dimensions?
A 20.00-mL sample of 0.150 M KOH is titrated with 0.125 M HCIO4 solution. Calculate the pH after the following volumes of acid have been added.
If 2.5 mL of seawater contains about .0000000000058 moles of gold (Au), how many atoms of gold are in that volume of seawater
what will be the temperature of the system when equilibrium is established? (sp Heat of H2O(s) = 2.09j/g . c (sp heat of H2O (l) = 4.18 J/g.c) Heat of Fus. of H2O(s)=333j/g
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