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CH101-Assignment 15

CH101-Assignment 15 - C 3 H 8(g is-2,220 kJ/mol What is the...

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1. A system does 300 J of work and releases 400 J of heat. What is E sys ? -700 What is E surr ? 700 J What is E univ ? 0 2. A system has 300 J of work done on it and releases 250 J of heat. What is E sys ? 50J What is E surr ? -50J What is E univ ? 0 3. Which of the following statements correctly describes an exothermic process? it has a negative value for H and the surroundings heat up it has a positive value for H and the surroundings cool down it has a negative value for H and the surroundings cool down it has a positive value for H and the surroundings heat up 4. The combustion of hydrocarbons (compounds containing only hydrogen and carbon) involve the reaction of the hydrocarbon with oxygen gas to form carbon dioxide and water. The enthalpy of combustion of one mole of propane gas,
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Unformatted text preview: C 3 H 8 (g) , is -2,220 kJ/mol . What is the enthalpy change for 12 CO 2 (g) + 16 H 2 O(l) 4 C 3 H 8 (g) + 20 O 2 (g) ? Hint : Don't forget our discussion about scale and direction of reactions. 8880 5. Use the data in textbook Table 9.2 (page 189), or the Bond Energy Resource in the on-line text to estimate the enthalpy change ( H) of the reaction: H 2 CBr 2 (g) + F 2 (g) H 2 CF 2 (g) + Br 2 (g) (Note: C is the central atom in the first reactant and the first product.)-452 6. Use the data in textbook Table 9.2 (page 189) or the Bond Energy Resource in the on-line text to estimate the enthalpy change ( H) of the reaction: C 2 H 2 (g) + 2H 2 (g) C 2 H 6 (g)-307...
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