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apch03_apqxnprac - 1982 B Water is added to 4.267 grams of...

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South Pasadena AP Chemistry Name ____________________________________ Period ___ Date ___/___/___ 3 Molecules & Compounds AP QUESTION—First Look Problem vs. Exercise An exercise is a calculation or other task where you know what to do. You are doing repeated examples to build up your skill, your speed, and your experience. A problem is a situation in which you do not know what to do. So… what do you do when you do not know what to do? Read the problem, read it again, read it again, calculate a few things, read it again, and hopefully things fall into place. You learn to solve problems by solving problems. You add ideas to your “bag of tricks.”
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Unformatted text preview: 1982 B Water is added to 4.267 grams of UF 6 . The only products are 3.730 grams of a solid containing only uranium, oxygen and fluorine and 0.970 gram of a gas. The gas is 95.0% fluorine, and the remainder is hydrogen. (a) From these data, determine the empirical formula of the gas. (b) What fraction of the fluorine of the original compound is in the solid and what fraction in the gas after the reaction? (c) What is the formula of the solid product? Note: There is also a part (d) that we would not yet know how to do....
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