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Calculate the content or concentration for each substance in the following mixtures.
(a) A solution that contains 250 mL of acetonitrile and 500 mL of methanol diluted with water to a total volume of 2.00 L
(b) A 15.2 g steel sample that contains 10.69 g iron, 2.67 g chromium, 1.22 g nickel, 0.306 g manganese, 0.153 g silicon and 0.122g carbon. What is the concentration of each substance
(c) A 5.00 L river-water sample that contains 25 g of dissolved solids
Lithium iodide has a lattice energy of and a heat of hydration of. Determine how much heat is evolved or absorbed when 40.0 of lithium iodide completely dissolves in water.
Based on the data gathered in the Rutherford's scattering experiments, the concept of atomic structure was modified. Which of the following aspects of the structure of the atom were validated by these experiments
when a clean iron nail is placed in an aqueous solution of copper(ll) sulfate, the nail becomes coated with a brownish black material.
Orange juice is an aqueous solution that derives much of it's acidity from citric acid. There are variations in the acidity of each brand depending on many factors
A buffer contains equal amounts of a weak acid and its conjugate base and has a pH of 5.25. Which of the following values would be reasonable to expect for the pH after addition of a small amount of HCl
boiling water at sea level is hotter than boiling water in the mountains. Water used to sterilize surgical equipment is heated to 120 degrees C at 2.0 atm in an autoclave.
Which of the seven Anions will be the hardest to detect (same anions as above), Why do you think this? If two or more are possible explain why.
For the reaction Cl2 + 2KBr -> 2KCl + Br2, calculate the percentage yield if 200 g of chlorine react with excess potassium bromide to produce 410 g of bromine
what are the structural formulas for the following compound : 6-bromo-2-methyl-3-heptyne
After completing the calculations below, sketch the pH curve for the titration of 20.0 mL of 0.200 M solution of a weak base, B (Kb = 1.9 x 10^-5), with 0.200 M HBr. Indicate the pH at (a) the beginning of the titration
What mass of water is necessary to prepare each of the following solutions? 1.) 200.0g of 1.30\% saline solution 2.) 80.00g of 15.0\% sugar solution
If 3.420g of ^226 Ra (t 1/2= 1620 yrs) is separated from its decay products and placed in a sealed 1L vessel, what is the partial pressure (in torr) of helium after 45 days if the vessel is at 0 degrees C? The half life of Rn is = 3.82 days
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