Unformatted text preview: 19. For the hypothetical reaction, the atomic weight of X is 66.6 amu. 3X 2 (g) > 2X 3 (g) ∆ H ° = 333 kJ Find ∆ H for the conversion of 11.1 g of X 3 Gas into X 2 gas. A. +9.25 kJ B. 9.25 kJ C. +2.00 kJ D. 333 kJ E. 2.00 kJ 20. When 72 g of a metal a t 97.0°C is added t o 100 g of water a t 25.0°C the final temperature is found to be 29.1°C. What is the heat capacity per gram of the metal? (Heat capacity of H 2 O = 4.184 J/g  °C ) A. 2.8 B. 2.0 C. 4.184 D. 0.35 E. 0.46 21. Which of the following changes always results in a NEGATIVE ∆ Esys? A. the system absorbs heat and there is no work done B. the system gives off heat and does work on the surroundings C. the system absorbs heat and does work on the surroundings D. the system absorbs heat and has work done on it E. the system gives off heat and has work done on it...
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 Fall '08
 Williamson
 Chemistry, Reaction, Vickie M. Williamson

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