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In developing the melting point of a compound, if the heating is carried out too fast, would the observed melting point be higher or lower and why?
A flask holds 100ml. When empty, is mass is 125.54g. When filled with a solution of potassium bromide, the mass of the flask and solution is 425.54 g. What is the density of the solution?
What are the boiling point and freezing point of a 4.33 m solution of naphthalene in benzene? (The boiling point and freezing point of benzene are 80.1°C and 5.5°C, respectively.)
The solubility of CO2 in water at 25°C and 1 atm is 0.034 mol/L. What is its solubility under atmospheric conditions? (The partial pressure of CO2 in air is 0.0003 atm.) Assume that CO2 obeys He
After the solid sank to the bottom of the graduated cylinder the volume in the graduated cylinder was read as 15.2 mL. What is the density of the solid?
If 0.015 M NaCl shows conductivity of 12,000 unites, based on "total ion concentration" what conductivity should be observed for 0.015 M K2SO4?
What is the importance of surface area (particle size), nucleation, and diffusion rate in terms of solid state reactions?
What is the pH of a buffer solution prepared by mixing 10.0 mL of 0.15 M ammonia and 15.0 mL of 0.20 M ammonium chloride?
Calculate the pCa+ of a solution that results from the mixing 50.0ml of 0.0100 M Ca+2 with the following solution which are buffered at a pH of 10.0:
What is the pressure in millimeters of mercury of 0.0105 mol of helium gas with a volume of 220 mL at a temperature of 50 degree Celsius?
Show that a 2.00 g sample of PbCl2 will dissolve in 25.0 mL of 1.00 M HCl.
The entropy chage for vaporization of Hi at its boiling point is 89.0 J.K-1.mol-1. If the heat of vaporization of HI is 21.2 kJ.mol-1, what is the boiling point of HI?
Calculate the pH of a solution formed by mixing 40.0ml of 0.1000 M HCl with 39.95ml of 0.1000 M NaOH and then diluting the entire solution to a total volume of 100ml.
These materials have plastic Deformation occur at the same Yield strain %. Which material has a better toughness and why?
Calculate the sodium ion concentration when 70.0mL of 3.0M sodium carbonate is added to 30.0mL of 1.0M sodium bicarbonate.
One of the most acidic lakes in the United States is Little Echo Pond in the Adirondacks in New York. Recently, this lake had a pH of 4.2, well below the recommended pH of 6.5.
If 32.7 mL of 0.225 M KOH is required to completely neutralize 28.0 mL of a CH3COOH solution, what is the molarity of the acetic acid solution?
Calculate the molality of each of the following solutions. (a) 15.9 g of sucrose (C12H22O11) in 690. g of water
Calculate the molarity and the molality of an NH3 solution made up of 27.5 g of NH3 in 70.0 g of water. The density of the solution is 0.982 g/mL.
Calculate the percent by mass of the solute in each of the following aqueous solutions.
The mass of an evacuated 255ml flask is 143.187g. The mass of the flask filled with 267torr of an unknown gas at 25*C is 143.289g. Calculate the molar mass of the unknown gas.
The hydrocarbon contains 93.75% carbon and 6.25% HYDROGEN. Calculate its empirical formula.
A stock solution is prepared by adding 15 mL of 2.5 M Ba(CN)2 to enough water to make 20 mL. What is the CN- concentration of 5 mL of the stock solution?
Question: A saturated aqueous solution of calcium hydroxide is approximately 0.13% calcium hydroxide, by mass, and has a density of 1.02 g ml^-1. What is the pH of such a solution?
Question: Consider the following reaction: CH3-Cl + I- ? CH3-I + Cl- Suppose we start the reaction with an initial concentration of CH3-I of 0.260M. Over a period of 1 hr 20 min, the concentration i