110sample_exam_Sample-Test3-chem110Aau04

110sample_exam_Sample-Test3-chem110Aau04 - (ii) How many...

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C H E M 1 1 0 N a m e : A u t u m n 2 0 0 1 S e c t i o n : 3 rd MIDTERM TEST 1. Calculate the mass of in grams of 4.56 mol of ethanol C 2 H 5 OH. 2. Calculate the number of molecules in 4.56 mol of ethanol C 2 H 5 OH. 3. Calculate the percent by mass of each of the atoms in ethanol C 2 H 5 OH.
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4. If 2.461 g of calcium metal is heated in Cl 2 gas and 4.353 g of Cl 2 is absorbed in forming the metal chloride, write an empirical formula of calcium chloride. Show your calculations. 5. A compound has the following composition: copper 66.75%; phosphorous 10.84%; and oxygen 22.41%. (i) What is the empirical formula of the compound?
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Unformatted text preview: (ii) How many moles would be present in 71.40 g of the compound? 6. Ammonium nitrate ( NH 4 NO 3 ) explodes into N 2 + O 2 + H 2 O (i) Write a balanced equation for this reaction: (ii) How many grams O 2 would be produced when 2.5 grams of ammonium nitrate explodes? 7. How many grams of urea are formed when 200 g of ammonia is reacted with 200 g of carbon dioxide? Show your calculations. The unbalanced chemical equation for this reaction is: NH 3 ( g ) + CO 2 ( g ) CN 2 H 4 O ( s ) + H 2 O ( l )...
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This note was uploaded on 05/17/2008 for the course CHEM 110 taught by Professor Rathod during the Fall '04 term at University of Washington.

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110sample_exam_Sample-Test3-chem110Aau04 - (ii) How many...

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