Chem 107 Worksheet: Empirical and Molecular Formulas Name: For all calculated answers, show all work, round to the proper number of significant figures and box your final answer Student ID 1

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Chem 107 Worksheet: Empirical and Molecular Formulas Name: For all calculated answers, show all work, round to the proper number of significant figures and box your final answer Student ID 1. A compound consists of 26.641 g of aluminum and 8.8944 g of carbon. Based on these amounts, what would be its empirical formula and compound name? 2. A compound is found to consist of the following composition: 31.42 % sulfur, 31.35 % compound? oxygen, and 37.23 % fluorine by weight. What is the empirical formula for this 3. The 38.25-gram product of a newly tried synthesis process was analyzed to consist of 74.01% rubidium, 5.20% carbon, and 20.78% oxygen. a. Indicate the mass breakdown of each element in the product b. Calculate the empirical formula of the product and a name for the compound 4. If 68.412 grams of cobalt metal is mixed with excess sulfur and heated strongly, a 124.250-gram sulfidle compound is produced. Calculate the empirical formula of the sulfide. 5. A compound with the empirical formula C2140 was found in subsequent experiments to have a molar mass of 220.26 g/mol. What would be the molecular formula of the compound? 6. A 17.28-gram sample of a new compound is analyzed to consist of 70.58% Hg, 12.47% Cl and 16.95% O. a) Give the masses of elements in the sample; b) calculate an empirical formula of the compoundi, c) If the new compound is determined to have a molar mass of 568 g/mol, find the molecular formula.