a1s-1 - Chemistry 2000 Spring 2001 Section B Assignment 1...

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Chemistry 2000 Spring 2001 Section B Assignment 1 Solutions 1. n KMnO 4 8 0g 158 032g mol 0 051mol m H 2 O 250mL 0 99823g mL 250g n H 2 O 250g 18 015g mol 13 9mol X K n K n H 2 O n K n MnO 4 0 051mol 13 9 0 051 0 051mol 0 0036 2. (a) Suppose that we take 1 L of this solution. This liter of solution contains 1.697 mol of acetone and weighs 0.9849 kg (from the concentration and density, respectively). The acetone weighs m acetone 1 697mol 58 079g mol 98 56g The water contained in our liter of solution therefore weighs m water 984 9 98 56g 886 3g The molality is therefore ˜ c 1 697mol 0 8863kg 1 915mol kg (b) Consider again our liter of solution. We know how many moles of acetone it contains. The number of moles of water can be determined from the mass: n water 886 3g 18 015g mol 49 20mol X acetone 1 697mol 1 697 49 20mol 0 03334 3. (a) A t 0 382 0 400mol L 0 32s 0 056molL 1 s 1 1
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(b) B t 2 A t 0 113molL 1 s 1 Notes: I am using ’s instead of d ’s because these are average rates. However, it would not be wrong to use derivative notation. It’s a matter of taste, and I’m not completely
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