Ch4(1-2)Sep15Fa08a

Ch4(1-2)Sep15Fa08a - WHY? 1. Many ________________ before...

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CHEM 109 General Chemistry University of Nebraska FALL 2008 Monday 15 September 2008 ANNOUNCEMENTS: EXAM 1 THURSDAY 5:45 pm; Get Seating Assignments
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6 12 6 2 5 2 STOICHIOMETRY!
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First: convert grams to moles Second: use mole ratios from the balanced equation to convert from moles A to moles B Finally: convert moles back to grams N 2 (g) + 3 H 2 (g) 2 NH 3 (g) How many grams of H 2 will form 68 g of NH 3 ?
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KClO 3 KCl P 4 O 10 + + Chemical Equations Two parts to a chemical equation: REACTANTS and PRODUCTS REACTANTS PRODUCTS If a match contained 1.00 g of P, how much P 4 O 10 would form? P red
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KMnO 4 C 3 H 8 O 3 CO 2 H 2 O + + Mn 2 O 3 K 2 CO 3 + + If 1.25 grams of glycerol (C 3 H 8 O 3 ) were reacted, what is the maximum amount of CO 2 that would form? Permanganate Volcano
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Diborane, B 2 H 6 , is a useful reactant in organic synthesis reactions. The compound can be formed by the following unbalanced reaction. NaBH 4 (s) + BF 3 (g) B 2 H 6 (g) + NaBF 4 (s) If the reaction only produces 75% of the diborane required, how many grams of sodium borohydride, NaBH 4 , is needed to synthesize 25.0 grams of diborane?
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Unformatted text preview: WHY? 1. Many ________________ before reaching completion. 2. __________ reactions often consume starting materials 3. When the product of a reaction is purified and isolated, some of it is inevitably ______ during the collection process. Yield of Products The amount of product calculated to form when all of the limiting reagent reacts is called the _______________ yield . The _______ yield is related to the _______ yield (what was actually recovered) and the theoretical yield (what could have been recovered in a perfect world). Theoretically, it is possible to make 443 g of geranyl formate (a scent from roses) from 375 g of geraniol. A chemist making geranyl formate for the preparation of a perfume uses 375 g of starting material and collects 417 g of purified product. What is the percent yield of this synthesis?...
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Ch4(1-2)Sep15Fa08a - WHY? 1. Many ________________ before...

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