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a) -11.3 kJ
b) -728 J
c) -1.13 kJ
d) -80.9 kJ
e) -91.9 kJ
a)5.67 kJ
b)15.99 kJ
c)2.58 kJ
d) 3.79 kJ
a) endothermic
b) exothermic
c) no energy released
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| Quiz On Section 3 |
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| Home Section3 Home |
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| 1. When 1.75 g of CaCl2 dissolves in 125 g of water in a coffee-cup calorimeter, the temperature increases by 2.44�C. What is the heat change per mole of CaCl2 dissolved in water? Assume that all the heat is absorbed by the water (c = 4.18 J/g��c).
a) -11.3 kJ b) -728 J c) -1.13 kJ d) -80.9 kJ e) -91.9 kJ |
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| 2. Calculate the heat required to melt 25.7 g of solid methanol at its melting point. a)5.67 kJ b)15.99 kJ c)2.58 kJ d) 3.79 kJ |
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| 3. When graphite is burned to yield CO2, 394 kJ of energy are released per mole of C atoms burned. When C60 is burned to yield CO2 approximately 435 kJ of energy is released per mole of carbon atoms burned. Would the buckyball-to-graphite conversion be exothermic or endothermic? a) endothermic b) exothermic c) no energy released |
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| Now let us see if you really know your chemistry... ANSWERS | |||||||||||||||||||||