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Add charges, single electron dots, and/or pairs of dots as appropriate to show the Lewis symbols for the most stable ion of each element. Treat n=4 as the valence shell in all casesAs, Br, Se, K, Ca, Ga
What is the concentration of the sodium ion (in M) in a solution of 0.607 M sodium sulfate
Calculate the molarity and mole fraction of acetone in a 1.82 molality solution of acetone in ethanol. Density of acetone is .788 g/cm^3. Density of ethanol is .789 g/cm^3. Assume that the volume of acetone and ethanol add.
How does the Hammond postulate explain: a. the greater selectivity for bromination vs. chlorination of an alkane? b. the fact that the relative reactivity of C-H bonds of an alkane for free radical chain halogenation is 1º>2º>3º
What mass of sucrose should be combined with 541 of water to make a solution with an osmotic pressure of 8.30 at 295 ? (Assume the density of the solution to be equal to the density of the solvent.)
What length of time (minutes) would be required to plate 12.25 g of nickel from a NiCl2(aq) solution?
A student weighed a piece of aluminum foil, rubber band, and a 250 ml flask and found it to be 107.520 grams. After a sample of unknown liquid is vaporized and condensed, the flask, aluminum foil and rubber band weighed 108.148 grams.
A solution is prepared by dissolving 14.4 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 11.50 mL sample of this stock solution is added to 55.00 mL of water.
Choose the answer in which the two atoms are listed in order of increasing ionization energy
A gas is expanded in a cylinder from 2.00 L to 12.0 L against an external pressure of 1.80 atm. At the same time, it absorbs 2.56 x 103 J of heat from the surroundings. Calculate ?E of the gas in J. (1 L•atm = 101.3J)
Calculate the pH at the equivalence point in a 0.10 M acetic acid/0.10 M sodium hydroxide titration when 27.4 mL of NaOH was used in titration.
Identify the conjugate base of CH3COOH in the following reaction
If the sample contains a combined total of 1.50 mol and has a total mass of 45.0g, what are the percentages of CO2 and Ne in the sample by mole?
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