ReciQues-04-1.pdf_, filename=_ReciQues-04-1.pdf_, filename=_ReciQues-04-1.pdf_, filename=_ReciQues

ReciQues-04-1.pdf_, filename=_ReciQues-04-1.pdf_, filename=_ReciQues-04-1.pdf_, filename=_ReciQues

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Chem 110 Recitation Problems – Chapter 4 Part 1 1 1. Solid tetraphosphorus decoxide (P 4 O 10 ) reacts with liquid water to form an aqueous solution of phosphoric acid. P 4 O 10 (s) + 6 H 2 O (l) ! 4H 3 PO 4 (aq) A. How many grams of phosphoric acid will form when 36.00 grams of tetraphosphorus decoxide reacts with 94.00 grams of water? B. What is the limiting reagent in the reaction? C. In this reaction, two reactants form one product. According to the Law of Conservation of Mass, matter cannot be created and/or destroyed during a normal chemical reaction. However, the mass of phosphoric acid produced (your answer in Part A), does not equal the total mass of the reactants (36.00 g + 94.00 g = 130.00 g total). Explain why these masses are not equal. 2. Hydrogen chloride is prepared commercially by the following balanced reaction. NaCl (s) + H 2 SO 4 (aq)
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Unformatted text preview: ! NaHSO 4 (s) + HCl (g) If a manufacturing plant is producing HCl with a percent yield of 82.3%, then how many grams of HCl would be obtained when 34.0 kg of NaCl are reacted with excess H 2 SO 4 ? Chem 110 Recitation Problems – Chapter 4 Part 1 2 3. When iron rusts, iron metal reacts with oxygen gas to produce solid iron (III) oxide according to the following unbalanced equation: Fe (s) + O 2 (g) ! Fe 2 O 3 (s) A. Give the balanced equation. B. Calculate the number of grams of Fe 2 O 3 produced from 15.8 g of Fe assuming the reaction goes to completion. C. How many grams of oxygen gas will be needed to complete the reaction in b? D. If only 14.5 grams of Fe 2 O 3 are produced, what is the percent yield for this reaction? E. If 15.8 g of Fe and 5.00 g of O 2 are reacted, which is the limiting reagent?...
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This note was uploaded on 04/12/2008 for the course CHEM 109 taught by Professor Malina during the Spring '08 term at UNL.

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