1. On a separate sheet of paper, define or describe the following terms: (1 poin
ID: 1030880 • Letter: 1
Question
1. On a separate sheet of paper, define or describe the following terms: (1 points each) a endo-vs exothermic reactions b. enthalpy d. enthalpy of formation e. enthalpy of reaction f. heat capacity 2. What is the enthalpy of formation, AHf. for the following: Norte: the AHf data can be found in Table6.4 (page 254) or Appendix 3 (p A-8 through 12). (1 point each) a. Fe (s) b. Fe,o, (9) c HO (9 d. H,O ) e. CO (g) Problems 3-6 are to be done on a separate sheet of paper. Each problem is worth 5 p 3. Use the AH, data in Table 6.4 (page 254) or Appendix 3 (p A-8 through A-12) to te as either e the enthalpy of reaction &H;? for the following reactions. Label each exothermic. 2H2 (g) +o,(g) c,H, (g) + 3 O2 (g) 2H20 (g) -2 , (g) + 2 H,O (g) a. -. A41,8 g cube of Cu was heated to 10°C and placed in 15° mL of HO at 25.C. What will be the final temperature of the water? The specific heat of Cu is 0.38 Jig and water is 4.18 Jig 113.4 g of iron at 100°C are put into 125 g of water at 22°C, when the system comes to thermal equilibrium, the temperature is 30.5 C. What is the heat capacity of iron? (The specific heat of water is 4.18 Jig) 5. a in J/g and b in J/mol
Explanation / Answer
1) The reactions which absorb heat are endothermic whereas the reactions which release heat are exothermic.
2) Enthalpy is a thermodynamic quantity which is the sum of internal energy of a system plus the product of pressure and volume of the system.
3) It is defined as the change in enthalpy when a substance is formed from its constituent elements.
4) Enthalpy of a reaction is defined as the change in enthalpy when a reaction occurs.
5) Heat capacity of a substance is defined as the amount of heat required to raise its temperature by one °C/ K.
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