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1 a) For calorimetry, what is the if the energy change of a gas when 25 kJ of heat is released from the system to the surroundings and 500 J of work is done on the system from the surroundings? b) Is this an endothermic or exothermic reaction? 2. For a calorimeter, what is the final temperature of 50.0 mL of water if 25 of heat is added to the system. The initial temperature of the water is 25.3°C. The specific heat of water is 4.18 J/g°C 3. Using the table from section 5.7 (Enthalpies of formation) in the lecture PPT slides to find the standard enthalpy for the following reaction CH,O,(s) + 60,(g) --à 6 CO, (g) 6H,O(I) Question- (5 points) Show all work and use the appropriate significant figures Question- 1. For a calorimeter, what is the initial temperature of the water, T1, if its mass is 25.3 kg, the heat exchanged is 35 J and the final temperature reached is 32.0 °C. 2. What is the enthalpy change, AH in kJ/mol for the following: 2F + C à 2A AH = 188 kJ/mol F + C à D AH = - -100 kJ/mol 2B + C à 2E AH = -200 kJ/mol A + B + C-à D + E AH = ????

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