Chemical Reactions Quiz 2

Chemical Reactions Quiz 2 - Al 2 (SO 4 ) 3 weighs 342 grams...

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Chapter 5 CHEM 120 Chemical Reactions and Quantities Practice Quiz 2 Name ________________________________ 2pts 1. Balance the following reactions: 3 Ca + N 2 ----- > Ca 3 N 2(g) C 3 H 8 + 5 O 2 ------ > 3 CO 2 + 4 H 2 O (error, get rid of one H) 2pts 2. What is chemical change? Give an example. A chemical change is one in which there is a change in chemical compostion. This is usually accompanied by some signs like permanent color change, bubbling, fizzing etc Example: A nail that has rusted is a chemical change 2pts 3. Calculate the molar mass of Al 2 (SO 4 ) 3 2 Al 2 x 27 g = 54 g 3 S 3 x 32 g = 96 g 12 O 12 x 16 g = 192 g By adding we get 342 g/mole OR we can say that 1 mole of
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Unformatted text preview: Al 2 (SO 4 ) 3 weighs 342 grams 2pts 4. How many moles of sulfur and oxygen are there in 3 mole of Al 2 (SO 4 ) 3 ? 1 mole Al 2 (SO 4 ) 3 2 mols Al 3 mols S 12 mols O 3 mols SO 4 2-3 mole Al 2 (SO 4 ) 3 6 mols Al 9 mols S 36 mols O 9 mols SO 4 2-2pts 5. How many moles of CO are produced when 24 grams of carbon react? 5C (s) + 2SO 2(g)------ > CS 2(g) + 4CO (g) 24 g C 24 g/12.01 g/mol = 2 mols C 2 mols C x 4 mols CO = 1.6 mols 5 mols C OR YOU CAN WORK IT OUT BY UNIT ANALYSIS x mols CO = 24 g C x 1 mols C x 4 mols CO = 1.6 mols CO 12.01 g C 5 mols C...
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Chemical Reactions Quiz 2 - Al 2 (SO 4 ) 3 weighs 342 grams...

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