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You believe your unknown compound is acetanilide that melts at 114-115 degrees, so you ask your professor for a sample of the pure compound to do a mixed melting point. You do the experiment and determine the mixed melting point is 106-110 degrees. What does this tell you?
Oxygen makes up 46.7 % by mass of the Earth's crust. How many grams of oxygen are present if a sample of the Earth's crust has a mass of 335 g
Calculate the change of volume of the cube at a depth of 1.000 km (disregarding the effects of temperature). Take the mean density of sea water as 1.03 g/cm3.
FireFlies flash at a rate that depends on temperature. At 29 C the average rate is 3.3 flashes every 10 seconds;at 23 C the average rate falls to 2.7 flashes every 10 seconds.
A student found that a brand B tablet would neutralize 0.011 moles of HCl per tablet. Which is the better buy, brand A or brand B? Why?
Calculate the pH of Benzoic acid if 0.0458 M is dissolved in water ( Ka = 6.40 x 10^-5) C6H5CO2H + H2O = (H3O+) + C6H5CO2 ^-1
what is the chemical calculation to figure out the follow: how many moles of the indicated solute does the following contain, 12.5 mL of 0.104 M HCL
Calculate the heat released when 2.58 L of Cl2(g) with a density of 1.88 g/L reacts with an excess of sodium metal at 25°C and 1 atm to form sodium chloride.
How many grams of calcium chloride will be produced when 29.0 g of calcium carbonate are combined with 15.0 g of hydrochloric acid?
A 5.0 g sample of a hydrate of BaCl2 was heated, and only 4.3 g of the anhydrous salt remained. What percentage of water was in the hydrate?
The purification of hydrogen gas is possible by diffusion through a thin palladium sheet. Calculate the number of kilograms of hydrogen that pass per hour (in kg/h) through a 4.7 mm thick sheet of palladium having an area of 0.25 m2 at 500°C.
Calculate the freezing and boiling point of the following solutions, assuming complete dissociation. a. 12.0 g FeCl3 in 162 g water
The amino acids found in proteins are all alpha-amino acids, but not all amino acids are alpha-amino acids. Suppose that a particular amino acid has alpha -, beta-, and gamma isomers. Which of the following will be the strongest acid
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