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In coffee, how much would the boiling point (in C) of the water be raised by the addition of 0.2 g of caffeine (C8H10N4O2) to 5.0 L of water in making this so much coffee? Ignore the other ingredients (except water and caffeine) & assume the final amount is 10.0 L (Kb for water is 0.512 K kg mol-1)
a. 0.0001b. 0.05c. 10 mind. 5 mine. 1.5 min
what is the density of hydrogen sulfide at 1.2 atm and 307 K? answer in units of g/L
A cell measured by a student was found to be -0.461V against a Ag/AgCl reference electrode (0.222V). What is the potential when measured against SCE and NHE
If a bottle of nail polish remover contains 177 ml of acetone, how much heat would be released by its complete combustion? The density of acetone is .788 g/ml
Calculate the pH of 1.00 L of a buffer that is 0.140 M HNO2 and 0.180 M NaNO2. What is the pH of the same buffer after the addition of 1.00 mL of 12.0 M. HCl. (pKa of HNO2 = 3.40). What is the pH of the Original buffer and after HCl is added?
Use condensed structures to illustrate the 3 possible charged species and the one neurtral species that can exist in aqueous environments for the polar acidic acid of your choice. Indicate which conditions are present in each of the four drawings.
A sample of an unknown metal has a mass of 35.4 and a volume of 3.11 . Whats the Density?
Will a precipitate of magnesium flouride form when 200.0 milliliter of 1.9x10^-3mol/Litre MgClsubnumber2 solution is added to 300.0 milliliter of 1.4x10^-2mol/Litre NaFsolution?
What is the maximum number of unpaired electrons an atom can have in this series? Will thsi be a new record for atoms in the periodic table?
In the preparation of the esters given in this experiment, the reaction product was extracted with 5% sodium bicarbonate solution in the isolation step. Why? What gas was evolved during this washing step? Write a balanced equation for the reaction..
Molecules can be as small as a few atoms or as large as thousands of atoms. In 1962, Max F. Prutz and John C. Kendrew were awarded the Nobel Prize for their discovery of the structure of hemoglobin.
calculate the wavelength of the emitted radiation if an electron in a hydrogen atom went from n = 4 to n = 1. in what region of the electromagnetic spectrum(e,g.X-ray, visible, infrared) would this radiation lie?
substance a and b are the same mass and at the same initial temperature. When the same amount of heat is added to each the final temperature of a is 75 degrees celsius
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