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how many kilograms does it take to sink a model barge with the following measurements in a calm pool; 300.00 cm * 25.00 cm * 68.00 cm with a mass of 850.0 grams
boron-fluorine single bonds are approximately 1.52A(152pm) in length. in BF3, the bond lengths are 1.30A. propose an explanation for this discrepancy, making use of resonance structures to illustrat
a) what is the ratio of conjugate base to conjugate acid after 100 ml of 1M HA is adjusted to a pH of 8? b) under the conditions in part a, how many moles of HA are present? How many moles of A- are
Calculate the pH of a solution prepared by diluting 2.5 mL of 1M acetic acid up to a final volume of 100 mL (pka 4.76)
Assuming levels of atmospheric CO2 are 390 ppm CO2, what is the pH of rainwater in equilibrium with the atmosphere for the pre-industrial atmospheric CO2 concentration of 280 ppm,v.
Explain the effect of pH on the aqueous solubility of dissolved organic matter (use the 13C NMR spectra on the International Humic Substances Society as your primary reference). Speculate on how DOM
Rank the following chemicals for their tendency to partition from the air into fog water- chloroform, acetic acid, methyl ethyl ketone, phenol, aniline, paraquat. Rank from highest fugacity to lowes
On the basis of your answer from part b, what knowledge can you have of the position of the electron. Can you relate this to the shape of the potential
Estimate and plot the vapor pressure (atm) of neat methacrylate, dioctyl phthalate and 2,3,7,8-octachlorodibenzodioxin over the temperature range 0oC-25oC.
Consider an electron moving from left to right (toward positive x) in a constant potential of V = 2.0 eV with total energy, E = 5.0 eV. Let the electron be described as a free particle such that the
What is the difference (in pH units) between the initial pH of a 0.20 M NH3 / 0.20 M NH4Cl buffer to the pH of the buffer after the addition of 10.0 mL of 0.10 M HCl to 65.0 mL of the buffer
An experiment is performed on an unknown material and produces the following heat curve. The temperature of the material is shown as a function of heat added. If the sample of material has a mass of
A 0.300 g sample of an aspirin tablet is used to prepare 100.0 mL of a stock solution by dissolving the tablet in 1 M NaOH then diluting with distilled water to the 100 mL mark of a volumetric flask
The percent transmittance, %T, reading on a Spectronic 20 for a certain solution is found to be 45%. Calculate the absorbance for the solution
A tetraaquasalicylatoiron(III) complex calibration solution is prepared by transferring 0.50 mL of a 0.00900 M salicylate dianion stock solution into a 10.00 mL volumetric flask and diluting to the
A solution of salicylate dianion is prepared by mixing 0.158 g of reagent grade acetylsalicylic acid in 5 mL of 1 M sodium hydroxide and heating the mixture until all of the solid dissolves.
containing too little oxygen to allow complete combustion of the fuel is called a rich mixture. A high-performance heater that burns propane, C3H8(g), is adjusted so that 100.0 g of O2(g) enters the
Describe the preparation of 0.250 L of 50.0 mM lactate buffer, pH 4.5 using a 0.5 M solution of lactic acid and 0.5 M solution of sodium lactate. pka=3.9
If you have 4.26 g of caffeine dissolved in 94.6 mL of water and the extraction coefficient between H2O and CH2Cl2 is 21.51. How many grams of caffeine will extract into the CH22Cl2 layer if you use
The combustion of 53.4 g of butane (c4h10) produces 95.6 g of co2. what is the percent yield of the reaction
Describe the preparation of a 1.50 M, pH 8.0 tris buffer (500 mL) using tris base (MW= 121.1 g/mol) and 3.0 M HCl. pKa of tris is 8.3
A compound is known to contain 51.27% carbon and 27.30% oxygen by mass. Each molecule contains two atoms of oxygen. What is the molar mass of this substance
Calculate to the correct number of significant figures the grams of potassum iodide that are present in 899.46 mL of an aqueous solution which is known to contain 17.960 g of potassum iodide per 100
What is the thickness of the resulting SiO2 water? The molecular weights of Si and SiO2 are 28 and 60 g/mol, respectively. The densities of Si and SiO2 are 2.33 and 2.27 g/cm3, respectively.
The united states food and drug administration requires that any product called vinegar contain at least 4% of weight by acetic acid .Assuming that the density of vinegar is the same as water, does