Chapter 1 2 and 3 sample exam

Chapter 1 2 and 3 sample exam - NAME: _Key_ WIKRENT...

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NAME: ____________Key_________________________WIKRENT CHM151IN 1. Balance the following reactions: (10pts) (a) (b) 2. The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet ® , is C 14 H 18 N 2 O 5 . 1000mg = 1g (20pts) (a) What is the molar mass of aspartame? 294.30g/mol (b) How many moles of aspartame are present in 1.00 mg of aspartame? 1.00mg (1g/1000mg)(1mole/294.3g) = 3.40 x 10 -6 mol (c) How many molecules of aspartame are present in 1.00 mg of aspartame? 3.40 x 10 -6 mol x (6.022 x 10 23 molecules/mole) = 2.05 x 10 18 molecules (d) How many hydrogen atoms are present in 1.00 mg of aspartame? 2.05 x 10 18 molecules x (18atmo of H/1molecules of Aspartame) = 3.69 x10 19 atom of H (e) What is the % C by mass in aspartame? (12 x 14)/294 x 100% = 57.1%
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3. Titanium metal can be obtained from its oxide according to the following equation: (15pts) TiO 2 (s) + 2C(s) Ti(s) + 2CO(g) If 28.6 g of Carbon is allowed to react with 88.2 g of TiO 2 , answer the following. a. What is the Limiting reagent in the above reaction?
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This note was uploaded on 09/08/2010 for the course CHEMISTRY 151 taught by Professor Wikrent,pollyanna during the Spring '10 term at Pima CC.

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Chapter 1 2 and 3 sample exam - NAME: _Key_ WIKRENT...

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