Review Session 1 - Review session 1 questions: 1) 1.014 g...

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Review session 1 questions: 1) 1.014 g of an element X reacts completely with 0.5792 g O to form an oxide with molecular formula X 2 O. 16.81 g of X reacts with 28.80 g of O to form a different oxide. The molar mass of this oxide is less than 100 g/mol. Determine the identity of X and the molecular formula of the unknown oxide. 2) When iron (II) hydroxide is mixed with phosphoric acid, iron (II) phosphate precipitate results. a) Balance the following equation: Fe(OH) 2 (aq) + H 3 PO 4 (aq) Æ Fe 3 (PO 4 ) 2 (s) + H 2 O (l) b) If 3.20 g of Fe(OH) 2 is treated with 2.50 g of phosphoric acid, what is the limiting reagent and what is the amount of the reactant in excess? c) How many grams of Fe 3 (PO 4 ) 2 precipitate can be formed? If 3.99 g of Fe 3 (PO 4 ) 2 is actually obtained, what is the percent yield?
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3) A mixture containing KClO 3 , K 2 CO 3 , KHCO 3 , and KCl was heated, producing CO 2 , O 2 , and H 2 O gases according to the following equations: 2KClO 3 (s) Æ 2KCl (s) + 3O 2 (g)
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This note was uploaded on 12/20/2010 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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Review Session 1 - Review session 1 questions: 1) 1.014 g...

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