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# scan-24 - Stoiehiometry II — CHEM 127-01 SWS Dr...

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Unformatted text preview: Stoiehiometry II — October 12, 2004 CHEM 127-01 SWS ' Dr. Schoonover Calculations 1 What is the molecular formula of a compound with a molecular weight of 175 g/mol that consists of 40. 0% carbon, 6. 7% hydrogen, and 53 3 % oxygen? '. ~109f‘ﬁ’ar‘t_ 33%“ Hel" wqu&,;ouwmol O 553,. two‘: ”sinnel {’1 l4? w—wmmv ha jﬁmi-I ”ECHLDJ. in" \$7” ” \0 iC»HLOggl 3 2. How many grams of sulfur dioxide can b% formed from 47 grams of Oz in the following equation? Zinc sulﬁde + oxygen 9 zinc oxide + sulfur dioxide 3. In a certain reaction, butane (C4H10) combusts to form carbon dioxide and water. Calculate how many grams of 02 would be needed to burn 25.0 g of butane. 4. POBrg can be prepared from the reaction of PBrs and diphosphorus pentoxide. a. Write a balanced equation for this reaction b. How many grams of PBr3 can be prepared from the reaction of 2.58 g of PBrs? c. How many grams ofP205 are needed to react all 2.58 g ofPBr5? 5. A 25.0 mL sample of sodium sulfate solution was added to an unlimited amount of a barium chloride solution to produce barium sulfate crystals: N32804 (aq) + BaClz (aq) '9 NaCl (aq) + BaSOr (aq) If 5.48 g of barium sulfate was obtained, what is its percent yield (assume 1 mL solution : 1 g)? 6. When treated with acid, lead (IV) oxide is reduced to a lead (ll) salt, with the liberation of oxygen in the unbalanced equation given below: Pb02 Jr l‘lNO3 9 beNOﬂ 2 ’ H30 4 02 a. What volume ofa 7.91 M HN03 solution is just suﬁieient to react with 15.9 g obeOz? b. If you initially start with 15.0 g Pb02 and 13.9 g HNO3, what is the theoretical yield of each product? Challenge Question: If 30.0 g of iron (H) chloride, 9.0 g of potassium permangate, and 13.0 g of HCl are mixed and reacted according to the equation below, which of the three reactants above would be the limiting reactant? 5FeClz + KMnO4 + 8HCl '9 5FeC13 + MnClg + KCl + 4H20 ...
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