Stoichemistry CH301 Spring 2011 pg 3

Stoichemistry CH301 Spring 2011 pg 3 - 018 10.0 points...

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tong (eyt88) – H02: Stoichiometry – mccord – (51600) 3 tivity for ovarian and breast cancer. It is sold under the trade name Taxol. On analysis, its mass percentage composition is 66.11% C, 6.02% H, and 1.64% N, with the balance be- ing oxygen. What is the empirical formula of paclitaxel? 1. C 49 H 53 NO 16 2. C 4 H 5 NO 9 3. C 35 H 41 NO 8 4. C 45 H 50 NO 13 5. C 47 H 51 NO 14 6. C 3 H 5 NO 4 015 10.0 points 14 carat gold has a purity of 58.3%. How many moles of gold are in 186 grams of 14 carat gold? Answer in units of moles. 016 10.0 points A sample of air contains 22 μ g/m 3 of beryl- lium dust. How many atoms of beryllium are present in a room with dimensions of 9 feet by 10 . 8 feet by 17 . 9 feet? Answer in units of atoms. 017 10.0 points Balance the equation ? H 2 CO + ? H 2 O ? CH 4 + ? O 3 . The coeFcients are 1. 3; 3; 2; 2. 2. 1; 2; 2; 3. 3. 2; 1; 2; 1. 4. 3; 3; 3; 2. 5. 3; 2; 1; 2.
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Unformatted text preview: 018 10.0 points Consider the reaction 4 e(s) + 3 O 2 (g) 2 e 2 O 3 (s). If 12.5 g of iron(III) oxide (rust) are pro-duced from 8.74 g of iron, how much oxygen gas is needed for this reaction? 1. 8.74 g 2. 21.2 g 3. 7.5 g 4. 12.5 g 5. 3.74 g 019 10.0 points How much O 2 is required for the complete reaction of 36 g of C 3 H 6 to form CO 2 and H 2 O? 1. 3.86 mol 2. 0.857 mol 3. 7.71 mol 4. 4.29 mol 5. 1.93 mol 020 10.0 points Upon heating, potassium chlorate produces potassium chloride and oxygen: 2 KClO 3 2 KCl + 3 O 2 . What mass of oxygen (O 2 ) would be pro-duced upon thermal decomposition of 25 g of potassium chlorate (KClO 3 with MW 122.5 g/mol)? 1. 3.3 g 2. 4.9 g 3. 4.4 g 4. 9.8 g...
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