Chapter 5 Review

The value of h o for the reaction below is 6535 kj

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10. The value of H O for the reaction below is -6535 kJ. How many kJ of heat are evolved in the combustion of 16.0 g of C 6 H 6 (l)? 2C 6 H 6 (l) + 15O 2 (g) 12CO 2 (g) + 6H 2 O(l) a. 1.34 x 10 3 b. 5.23 x 10 4 c. 673 d. 2.68 x 10 3 e. -6535 11. The value of H O for the reaction below is -482 kJ. Determine the amount of heat (in kJ) exchanged with the surroundings when 12.0 g of CO(g) completely reacts. 2CO(g) + O 2 (g) 2CO 2 (g) 12. 2H 2 (g) + O 2 (g) 2H 2 O(g) H = -483.6 kJ 4H 2 (g) + 2O 2 (g) 4H 2 O(g H = _____kJ 13. Consider the following reaction: 2 Ba(s) + O 2 (g) 2 BaO(s) H = -1107 kJ How much heat (in kJ) is transferred when 5.75 g of BaO(s) is produced? 14. The heat capacity of lead is 0.13 J/g-K. How much heat (in J) is required to raise the temperature of 15 g of lead from 22 o C to 37 o C? a. 2.0 b. -0.13 c. 5.8 x 10 -4 d. 29 e. 0.13 15. When 29 J of heat is transferred to 15 g of lead at 22 o C, the temperature of the lead increases to 37 o C. What is the specific heat capacity (in J/g-K) of lead?

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16. A sample of water (55.0 g) at 69.0 o C is added to an unknown amount of water at 22.0 o C. The final temperature is 31.0 o C. How many grams of water were there initially at 22.0 o C? The specific heat of H 2 O(l) is 4.18 J/g-K. 17. If 73.51 J of heat were added to 25.6 g of water at 25.3 o C, what would be the final temperature of the water? 18. If 127.2 J of heat were added to 152.6 g of water at 25.3 o C, what would be the final temperature of the water? a. 6.75 o C b. 64.4 o C c. 152.5 o C d. 25.5 o C e. 18.8 o C
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