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Fall 2008 Exam 2 with answers

# Fall 2008 Exam 2 with answers - Exam II from Fall 2008 2...

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Exam II from Fall 2008 2 Name__________________________________ Part I 1. (20 points) Carbon dioxide (CO 2 (g)) dissolves in water to produce carbonic acid H 2 CO 3 . 2 2 2 3 CO H O H CO + Aluminum carbonate, A1 2 (CO 3 ) 3 , can be used as an antacid (not the best choice however!). How many grams of aluminum carbonate can be formed from combination of 10.0 L of CO 2 (g) at STP with 500. mL of 0.543 M A1(OH) 3 which reacts by the following unbalanced equation? 3 2 3 2 3 3 2 ( ) ( ) Al OH H CO Al CO H O + +

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3 Name__________________________________ 2. (15 points) Given the following: o f 2 2 ΔH (C H (g)) = 227 kJ/mole o f 2 ΔH (CO (g)) = -344 kJ/mole o f 2 ΔH (H O( )) = -286 kJ/mole l o f 2 4 ΔH (C H (g)) = 52.3 kJ/mole (a) Calculate the heat of combustion of 2 2 C H (g) . (b) How much heat in kJ would be evolved in combustion of 1.00 g 2 2 C H (g)?
4 Name__________________________________ Part II – Place Answers on Cover Page 1. A mixture of 1.00 g of HCl and enough water to give 100. mL of solution will have what molarity? (a) 0.274 M (b) 0.548 M (c) 0.0100 M (d) 0.0274 M (e) 0.0548 M

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