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25 mL of an unknown vinegar solution is diluted with 225 mL of water. 50 mL of this mixed solution is put into another beaker and diluted with 50 mL of water. In order to figure out the molarity, w
A graduated cylinder was filled to 25mls with liquid. Then a solid object weighing 73.5 grams was immersed in the liquid, raising the liquid level to 43.9 mls. What is the density of th
A sample of oxygen at 65 degrees C under a pressure of 800 torroccupies 425 mL. What volume would it occupy at standard conditions?
If a fractional distillation failed to separate two component sefficiently, what alternatives would one consider to effect clean separation by distillation?
Explain why the boiling point of a two-component mixture rises slowly throughout a simple distillation when the bioling point difference are not large.
Two components have boiling points of 130 C and 150 C. Estimate the number of theoretical plates needed to separate these substances in a fractional distillation.
Find the heat of solution for lithium iodide and determine how much heat is evolved or absorbed when 15.0 g of lithium iodide completely dissolves in water.
How much energy must be removed from a 125g sample of benzene(molar mass=88.11g/mol) at 425 k to liquify the sample and lowerthe temperature to 335.0k?
Three test tubes, labeled A, B, and C, contain substances with approximately the same melting points. How could you prove the testtubes contain three differet chemical compounds?
A 45-g piece of ice 0 degrees C is added to a sample of water at 8 degrees C. All of the ice melts and the temperature of the water decreases to 0 degrees C. How many grams of water were
In an experiment mixing hydrogen chloride, water, and magnesium using a beaker filled with water and the buret containing the water, hydrogen chloride and magnesium the water levels could not be equ
Acontinuous reactor is used to react propylene C3H6 with hydrogenchloride HCl using thefeed containing only these 2 species. The product stream contains51.7 mol. %C3H7Cl and 17.3 mol. % HCl.
A solution consists of 10 g of liquid x, whose molecular weight is 50, and 9g of liquid y, whose molecular weight is 30. the vapor pressure of pure x and pure y at 20 C are 40 and 70mm, respectively
An inflated balloon has a volume of 6L at sea level (1 atm) and is allowed to ascend in altitude until the pressure is 0.45 atm. During the ascent the temperature of the gas falls from 22 degrees C
Why is sulphuric acid used in the titration of ferrous sulphate with oxalic acid instead of hydrochloric or nitric acid?
Determine the relative positions of the organic layer and the aqueous layer in a separatory funnel after shaking each of the following solvents wth an aqueous phase.
Describe what happens as the polystyrene is formed, using equations and words. why is this called a "step polymerization"?
Kodel is a condensation polymer made from terphthalic acid and1,4-cycohexandimethanol. Write the structure of the resulting polymer.
If a 1.0 m solution of glucose, Na2SO4and (NH4)3PO4, is made, which one will have the lowest vapor pressure, highest boiling point and lowest freezing point?
A student collected hydrogen gas in a buret by displacing water at26.0 degrees Celsius. The buret could not be submerged deepenough in a water bath to equalize the pressure.
Copper crystallizes in a face-centered cubic lattice. If theedge of the unit cell is 351 pm, what is the radius of the copperatom?
A crude organic compound containing traces of sulfuric acid is dissolved in dichloromethane, and then "washed" with water. Will the organic compound be dissolved in the upper layer? Breifly explain
Demonstrate that if 100mL of solution of a5.0 g of A in water were extracted with two 25 mL portion of ether,a smaller amount of A would remain in the water than if the solution was extracted with o
Astudent spots an unknown sample on a TLC plate and develops it in adichlormethane solvent. Only one spot develops with an RF value of 0.95. This single test does not verify that the unknown substan
Acolorless unknown substance is spotted on a ZTLC plate And developed in the correct solvent. The spots do not appear when visualization with at UV lamp or iodine vapors is attempted.