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In 1.0 atm of pure oxygen, the solubility of O2 (g) in water is 1.26 X 10^-3 M at 25.0 degrees C. The mole fraction of oxygen in air is .210. If the atmospheric pressure is .979 atm, what is the solubility of oxygen in air at 25.0 degrees C?
what mass of carbon tetrachloride,CCl4, must be vaporized at 100 degrees celsius to fill a flask with a volume of 275.0 ml when the atmospheric pressure is 753.9 torr. If the experiment is repeated at the same temperature but a greater atm pressur..
When square brackets are placed around the formula for a substance, such as [NaOH], it indicates that we are working with the percent-by-mass
In the recrystallization procedure, an Erlenmeyer flask is commonly used during the step in which the crude is dissolved in the solvent of choice. Furthermore, if the recrystallization is slow typically the flask is closed with a cork.
C5H12, 10.0 g hexane, C6H14 and 10.0 g benzene, C6H6. What is the mole fraction of hexane?
Platinum crystallizes with a face centered cubic lattice. The atomic radius of platinum is 0.138nm, and the atomic mass is 195.1 . (a) Calculate the lattice parameter of Pt from these data
An unknown metal m reacts with sulfur to form a compound with the formula M2S3. If 3.12g of m reacts with 2.88g of S, what are the names of M AND M2S3
An iron bar of mass 885 g cools from 94°C to 5°C. Calculate the heat released (in kilojoules) by metal.
Sample has a mass of 0.171 g at a pressure of 761 mm Hg and a temperature of 32oC. What is the molar mass of the gas? R=0.0821 L atm / mol K
What mass of a copper ore consisting of 46% copper(I) sulfide must be mined in order to produce 1.0 x 10^3 kg (1.0 metric ton) of copper metal?
If the concentration of Mg2+ ion in seawater is 1350 mg/L, what OH- concentration is required to precipitate Mg(OH)2
A flask containing only NO2(g) at an initial pressure of 8.60 atm is allowed to reach equilibrium. Calculate the total pressure in this flask at equilibrium.
Caffeine has a distrubution coefficient of 8.4 for methylene chloride/ water. How much caffiene will be extracted from a 200 mL cup of Turkish coffee (250 mg caffeiene) by 100 mL of methylene chloride?
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