CHEM 101 2014 Week 2.doc - CHEM 101 Recitation Problems Week 8 Chapter 7 49 Calculate the theoretical yield of the product(in moles for each initial

CHEM 101 2014 Week 2.doc - CHEM 101 Recitation Problems...

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CHEM 101 Recitation Problems Week 8 Chapter 7 49. Calculate the theoretical yield of the product (in moles) for each initial amount of reactants. Ti ( s ) + 2 Cl 2 ( g ) TiCl 4 (s) a. 4 mol Ti, 4 mol Cl 2 c. 12.4 mol Ti,18.8 mol Cl 2 51. Zinc sulfide reacts with oxygen according to the following reaction: 2 ZnS ( s ) + 3 O 2 ( g ) 2 ZnO ( s ) + 2 SO 2 ( g ) A reaction mixture initially contains 4.2 mol ZnS and 6.8 mol O 2 . Once the reaction has occurred as completely as possible, what amount (in moles) of the excess reactant remains? 59. Urea (CH 4 N 2 O) is a common fertilizer that is synthesized by the reaction of ammonia (NH 3 ) with carbon dioxide: 2 NH 3 ( aq ) + CO 2 ( aq ) CH 4 N 2 O ( aq ) + H 2 O ( l ) In an industrial synthesis of urea, a chemist combines 136.4 kg of ammonia with 211.4 kg of carbon dioxide and obtains 168.4 kg of urea. Determine the limiting reagent, theoretical yield of urea, and percent yield for the reaction. MW urea = 60.054 g/mol; MW ammonia = 17.031 g/mol; MW carbon dioxide = 44.01 g/mol; MW water = 18.01 g/mol. 23. What is the molarity of NO
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Unformatted text preview: 3-in each solution? c. 0.150 M Al(NO 3 ) 3 1 CHEM 101 Recitation Problems Week 8 27. A laboratory procedure calls for making 400.0 mL of a 1.1 M NaNO 3 solution. What mass of NaNO 3 (in g) do we need? 29. If 123 mL of a 1.1 M glucose solution is diluted to 500.0 mL, what is the molarity of the diluted solution? 34. Identify each energy exchange as primarily heat or work and determine the sign of Δ E (positive or negative) for the system. 1. A rolling billiard ball collides with another billiard ball. The first billiard ball (defined as the system) stops rolling after the collision. 2. A book is dropped to the floor. (The book is the system.) 3. A father pushes his daughter on a swing. (The daughter and the swing are the system.) 38. The air in an inflated balloon (defined as the system) warms over a toaster and absorbs 115 J of heat. As it expands, it does 77 kJ of work. What is the change in internal energy for the system? 2...
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