Chem exam 2 answers - 1. (Points: 5.0) What is the...

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1. (Points: 5.0) What is the oxidation number of iodine in IO3-? 1. +7 2. -1 3. 0 4. +5 5. +3 2. Copper reacts with nitric acid to produce copper(II) nitrate, nitrogen dioxide gas, and water. Cu(s) + 4 HNO3(aq) ® Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O(l) If you have 2.5 moles of Cu, 1. you need at least 10.0 moles of HNO3 to produce 2.5 moles of Cu(NO3)2. 2. you need at least 2.0 moles of HNO3 to produce 1.0 moles of Cu(NO3)2. 3. you need at least 0.25 moles of HNO3 to produce 0.5 moles of Cu(NO3)2. 4. you need at least 0.13 moles of HNO3 to produce 0.5 moles of Cu(NO3)2. 5. you need at least 2.0 moles of HNO3 to produce 2.0 moles of Cu(NO3)2. 3. (Points: 5.0) Write a net ionic equation for the reaction of limestone and a strong acid. 1. CaCO3(s) + 2 HCl(aq) ® CaCl2(aq) + H2CO3(aq) 2. CaCO3(s) + 2 H+(aq) ® Ca2+(aq) + CO2(g) + H2O(l) 3. CaCO3(s) + 2 H+(aq) ® Ca2+(aq) + H2CO3(s) 4. Ca(s) + 2 H+(aq) ® Ca2+(aq) + H2(g) 5. CaO(s) + 2 H+(aq) ® Ca2+(aq) + H2O(l) 4. The reaction of 40.0 g H2(g) with 5.0 g O2(g) yields 2.3 g H2O(g). What is the percent yield of this reaction? 2H2(g) + O2(g) = 2 H2O(g)
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1. 27.3% 2. 74.9% 3. 9.43% 4. 66.8% 5. 40.9% How many moles of potassium bromide can be produced from the reaction of 1.78 moles
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This note was uploaded on 03/25/2010 for the course CHEM CHEM 181 taught by Professor Tamburro during the Spring '10 term at Ocean County College.

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Chem exam 2 answers - 1. (Points: 5.0) What is the...

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