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A sample of pure benzene was found to freeze at 5.48*C. A solution made by dissolving 20.0 g of an unknown compound in 500 g of benzene was found to freeze at 3.77* C. Given that the molar freezing point constant of benzene is 5.12* C/m, what is the molar mass of the unknown compound? (Assume the unknown compound is a nonelectrolyte) delta T = Kfxm
Use VSEPR theory to decide which one of the following molecules and ions will definitely have at least one 90º bond angle in it.
a saline solution contains 150 mEq/L each of Na+ and Cl- how many moles of Na+ and Cl- are in 2.50L of the solution
how do you find the specific heat of platinum if 23.6 grams is heated from 10.0c to 20.0c using 30.68 J of heat.
Assuming your sample of cereal is 10.00 grams and a recommended serving of cereal is 30.00 grams, how many mg of iron would you expect to extract from your sample
How many times faster (to 0.01 X faster - that is, what is the ratio of v20/v44) would the rate of diffusion of a gas with a molecular mass of 20 g/mol be than the rate of diffusion of a second gas having a molecular mass of 44 g/mol?
We know that temperature affects solubility of gasses in a liquid. As a climatologist, this concept is crucial to understanding changes that are taking place.
if a gas is at 2.3 atm of pressure and occupies 32 L of volume, how much volume will it occupy if the pressure is lowered to 1.5 atm?
a chemist weighed out 5.25 g of a mixture containing unknown amounts of baos and caos and placed the sample in a 1.50-l
If oxygen gas were collected over water at 295K and the total pressure of the wet gas were 710 mm Hg, what would be the partial pressure of the oxygen
Problem- Acidic ether cleavages are typical substitution reactions. Use the information in table of bond energies in the textbook to calculate delta H for the reaction of ethyl methyl ether with hydrogen chloride and hydrogen iodide.
A sealed container holds 1.00 mole of helium and 2.00 moles of nitrogen at 30.0°C. When the total pressure of the mixture is 666 mm Hg, what is the partial pressure of the nitrogen in mm Hg? Provide an answer correct to 2 significant figures.
Considering only the R-groups for the amino acids below, which one would NOT contain a nucleophile at a high pH (> 11) a. Lys b. Ser c. Cys d. Trp e. none of the preceding
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