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What is the pressure of a 3.00 L gas vessel that has 18.0 grams of helium at 25 degrees Celsius
Which of the compounds contain chiral centers? (you may choose more than one answer)
when mixture A at 273 K is heated to 473 K, mixture B results. How many different chemical changes occur? How many different physical changes occur?
Which of the following solvents, hexane, methylene chloride, acetone, or methanol will give the best seperation on a TLC plate of a mixture composed of
What is the density in g/L of a gas mixture that contains 27% F2 and 73% He by volume at 714 mm Hg and 27.5 C.
Given Data; P4+6Cl2=4PCl3 change temp= -2439 kj ,4PCl5=P4+10Cl2 change temp= 3438 kj calculate change in temp for the reaction PCl5=PCl3+Cl2.
The nuclide Pb-210 undergoes three successive decays (beta, alpha, and beta, respectively) to form a stable nuclide. What are the three nuclides which form from Pb-210 in this decay series
Measurements of strontium in enamel from extracted wisdom teeth were done by atomic absorption spectroscopy. Solutions were prepared with a constant total volume
Forty miles above the earth's surface, the temperature is 250 K and the pressure is 0.12 mm Hg. What is the density of air at that altitude. Assume the molar mass of air is 28.95 g/mol
What is the molecular formula of sulfur under these conditions. Type your answer using the format CO2 for CO2.
Empirical and Molecular Formulae, The analysis of an organic compound produces the following elemental analysis: % C is 59.999% and % H is 4.476%.
Calculate the feed ratio of adipic acid and hexamethylene diamine that should be employed to obtain a polyamide of approximately 15,000 molecular weight at 99.5% conversion.
how many no. of hydrogen ions are present in 10 millionth part of 1.33 cc of pure water at 25 degree celsius.
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