[CHM113] 113DQ3

[CHM113] 113DQ3 - Discussion Quiz #3 Chem 113 AA/AB Name_...

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Discussion Quiz #3 Name______________________________ Chem 113 AA/AB Section_________________ 1. How many molecules are in 3.7 g of carbon monoxide? (3pts) 2. Write the correct balanced equation for the reaction of potassium hydroxide with nitric acid. (2 pts) 3. For the balanced reaction, 2C 2 H 6 +7O 2 6H 2 O + 4CO 2 , if 3.7 moles ethane, C 2 H 6, are mixed with 4.1 moles oxygen, how many moles of water and carbon dioxide are produced? (3 pts) 4. What is the difference between empirical and molecular formulas? (1 pt) 5. What are the two components of the mixture for this week’s lab? (1 pt)
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Discussion Quiz #3 Name_______ KEY ___________________ Chem 113 AA/AB Section_________________ 1. How many molecules are in 3.7 g of carbon monoxide? (3pts) 3.7g (1mol/28g) (6.022 E23 molecules/1mole) =8.0E22 ½ pt for correct molecular weight, ½ pt for correct sig figs, 1 pt correct problem setup and 1 pt for correct answer 2. Write the correct balanced equation for the reaction of potassium hydroxide with nitric acid. (2 pts) KOH + HNO3 KNO3 + H2O 1 pt for all correct reactants and 1 pt for correct products 3. For the balanced reaction, 2C 2 H 6 +7O 2 6H 2 O + 4CO 2 , if 3.7 moles ethane, C 2 H 6, are mixed with 4.1 moles oxygen, how many moles of water and carbon dioxide are produced? (3 pts) 3.7 moles ethane/2 = 1.85; 4.1 moles O2/7 =0.586, oxygen is LR 4.1 moles O2 (6 water/7 oxygen)=3.5 moles water 4.1 moles O2 (4 carbon dioxide/7oxygen)=2.3 moles carbon dioxide 1 pt sig figs, 1 pt water calc, 1 pt carbon dioxide calc 4. What is the difference between empirical and molecular formulas? (1 pt) Empirical is the simplest ratio, molecular is actual ratio 5. What are the two components of the mixture for this week’s lab? (1 pt) NaCl and NaHCO 3 or sodium chloride and sodium bicarbonate ( ½ pt each)
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Discussion Quiz #3 Name______________________________ Chem 113 AC/AD Section_________________ 1. Give the oxidation number for each atom in the following molecules: (3pts)
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This note was uploaded on 08/12/2008 for the course CHM 113 taught by Professor Anbar during the Spring '06 term at ASU.

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[CHM113] 113DQ3 - Discussion Quiz #3 Chem 113 AA/AB Name_...

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