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CHEM 111 (69)

Reaction coefficients, basic process

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Colorado State University
CHEM 111
Dana Johnson

29 November Clicker question In the following reaction, what is being reduced? PbO (s) + CO (g) → Pb (s) + CO (2) A. PbO (Pb goes from +2 to 0, gain of electrons) B. CO C. Pb D. CO 2 PbO + CO → Pb + CO 2 Oxidation numbers are +2, -2, +2, -2 → 0, +4, -4 Clicker question In the following reaction, what is the oxidizing agent? PbO (s) + CO (g) → Pb (s) + CO (2) A. PbO (Oxidizing agent is reduced) B. CO C. Pb D. CO 2 Review of reaction coefficients The only numbers changed when balancing equations Indicate amounts of material in a complete reaction Thought of as numbers of moles (or molecules) Can be used as conversion factors Simple examples Must use coefficients to convert among compounds in an equation, remembering these are moles 2N H (l) + N O (l) → 3N (g) + 4H O (g) 2 4 2 4 2 2 2 moles N H → 3 moles N 2 4 2 4 moles H O → 1 mole of N O 2 2 4 0.317 moles of N H → 2.446 moles of N 2 More complicated Many problems will be in terms of mass Must convert to moles before solving Mass example Given the following equation, what mass (grams) of water is produced when 24.5 g of Cr 2 r3acts completely? Cr 2 (3) + 3H S (g2 → Cr S (s) +23H3O (l) 2 24.5 g Cr O 2 13mol Cr O / 1522g C3 O x 3 mol H 2 /31 mol Cr O x 12.016 g H O / 2 3 2 1 mol H O 2 8.71 g H O 2 Solution example
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