aq 2MnO 4 aq 2H aq 3SO 4 2 aq 2MnO 2 s H 2 O l The student then realizes that

# Aq 2mno 4 aq 2h aq 3so 4 2 aq 2mno 2 s h 2 o l the

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(aq) + 2MnO4!(aq) + 2H+(aq) "3SO42!(aq) + 2MnO2(s) + H2O(l) The student then realizes that the reaction is supposed to be balanced in basicsolution. Balance the reaction in basicsolution. (5 pts) III. PROBLEMS. Show your work as well as your solution on the grading sheet. 1. A 275-g sample of nickel at l00.0°C is placed in 100.0 mL of water at 22.0°C. What is the final temperature of the water? Assume that the system (the nickel and water) neither loses nor gains heat from the surroundings. Specific heat capacities: nickel = 0.444 J/(g·K), water = 4.184 J/(g·K). The density of water is 1.00 g/mL. (9 pts) 2. A common laboratory reaction is the neutralization of an acid with a base. When 50.0 mL of 0.500 MHCl at 25.0°C is added to and neutralizes 50.0 mL of 0.500 MNaOH at 25.0°C in a coffee cup calorimeter, the temperature of the mixture rises to 28.2°C. What is the heat of reaction per mole of acid? Assume the mixture has a specific heat capacity of 4.18 J/(g·K) and that the densities of the reactant solutions are both 1.00 g/mL. (8 pts)

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• Fall '08
• kirkpatrick