Question

1. Calculate AE and determine whether the process is exothermic or endothermic for the following cases: L. When a chemical reaction produces 90.7 kJ of heat but does no work on its surroundings. il. When combustion of a gas releases 2100U of heat to its surroundings. ii. When 33.05 kd of heat is transferred to the system and 22.0 kJ of work on the surroundings. Iv. When 121 kJ of work is performed by the surroundings on the system. Process is: Process is: Process its Process is: Process is AE - v. When in a chemical reaction, the system gains 0 3815 J of heat and 420 J work is done. BEad 2. Consider the following reaction: H 284.6k 2Os ()30 (g) a. Is the reaction endothermic or exothermic? b. Which has the hilghest enthalpy under these conditions, the reactant, O, or the product, Ox? c. Draw the enthalpy diagram for the reaction? 3. Designate each statement as True or False. a) The heat used to raise the temperature of a substance by 1°C is known as enthalpy b) Breakage of bond is always an endothermic process and is known as bond enthalpy c) if the reaction is reversed, it would have no impact on the amount of heat evolved or absorbed d) Bond enthalpy and internal energy are both extensive properties. e) Enthalpy, internal energy and heat are all state functions ) The standard enthalpy of formation of Ar (a) is Oki/mol. Page 1 of 3

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Answer 1