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The osmotic pressure of a fraction of poly(vinyl nchloride) in a ketone solvent was measured at 25°C. The density of the solvent (which is virtually equal to the density of the solution) was 0.798 g cm-3. Calculate the molar mass and the osmotic virial coefficient, B, of the fraction from the following data:
c/(g /102cm3)
0.200
0.400
0.600
0.088
1.000
h/cm
0.48
1.2
1.86
2.76
3.88
A 25.0 g sample of pure iron at 85.0°C is dropped into 75 g of water at 40.0°C. What is the final temperature of water-iron mixture?
The Kb value for Hydrazine is 1.3x10^-6. What is the pH of the solution before any HCl has been added
calculate the volume of reagent required for the reaction, assuming the starting mass of copper used is 1.00g.
The initial mass of the crude ether was 141mg. The mass after recrystallization was 121mg. Calculate the percent recovery from recrystallization.
What is the pH of a buffer that consists of 0.45 M CH3COOH and 0.35 M CH3COONa? Ka = 1.8 × 10-5
2 drops of methyl orange indicator are added to a 25.0 mL sample of strontium hydroxide. A 0.073 M HCl solution (titrant) is dispensed into the solution (analyte). The solution turns from yellow to red after the addition of 29.5 mL.
Sulfuric acid is formed when sulfur dioxide reacts with oxygen and water. write the balenced chemical equation for the reaction. if 12.5 mol SO2 reacts, how many mol H2SO4 can be produced. How many mol O2 is needed.
Draw the correct molecular geometries of the following covalent compounds. Use the electronegativity differences between the atoms in each bond pair to determine the presence and direction of individual bond dipoles in each molecule.
magnesium burns in air to produce magnesium oxide mgo and magnesium nitride mg3n2. magnesium nitride reacts with water
Bacteria reason milk to go sour by generating lactic acid. Formulate an experiment that could measure the activation energy for the production of lactic acid by bacteria in milk. Explain how your experiment will provide the information you need to..
Draw a complete lewis structure for the CONJUGATE ACID of Nitromethane (condensed formula CH3NOOH). Draw a complete lewis structure that shows all bonds, unshared electron pairs, and minimized formal charges where appropriate.
Write a balance equation for the reaction of nitric acid (HNO3) with each base solution : [1]. NaHCO3, [2]. MgCO3. ( Please include the phases of the substance)
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