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Unformatted text preview: nanni (arn437) Compositional Stoichiometry - video CNS (87654) 1 This print-out should have 4 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points We observe that 0.123 mole of the element bromine combines with 0.123 mole of the ele- ment lead to form a compound. What is the empirical formula for the compound? 1. PbBr 5 2. PbBr correct 3. Pb 2 Br 4. Pb 2 Br 3 Explanation: The empirical formula is the simplest whole-number ratio of atoms present in the molecule. The ratio of atoms in a compound is the same as the ratio of moles of atoms in a mole of the compound. We are given that 0.123 mol of bromine combine with 0.123 mole of lead. Since equal number of moles of each combine to form the compound, the ra- tio of moles bromine to moles of lead is one to one, and the empirical formula is PbBr. 002 10.0 points How many moles of potassium ions are present in 1.2 moles of K 2 SO 4 (potassium sulfate)?sulfate)?...
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This note was uploaded on 09/19/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.
- Fall '07