CHEM 111 Lecture Notes - Lecture 7: Molar Mass, Lead
21 Dec 2015
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Chem111 lecture 7 percent composition and chemical equations. Calculate a formula from percent composition: e. g. a compound contains only c, h, and o. C is 73. 14% and of h is 7. 37%. Thus, out of the 100g, 73. 14g are c and 7. 37g are h. Subtract to find the grams of o. Now, count = mass in g (c, h, or o) / molar mass. Now convert your answers to whole numbers by picking the. 7. 37g h / 1. 001g = 7. 3115 smallest number first and then divide it by the others. If whole numbers aren"t reached by now, then multiply each figure by the same factor until you get whole numbers. Ch4 + o2 co2 + h2o. Sometimes add an indication of conditions and energy released. Light: hv (greek nu) and/or heat: (delta) (greek delta) Octane burns to form carbon dioxide and water. If you can write the equation it does not mean that particular reaction occurs.
