ul arisWer. In a chemical reaction, compound A is convert to compound B. In the
ID: 1056509 • Letter: U
Question
ul arisWer. In a chemical reaction, compound A is convert to compound B. In the process, energy is absor from the surroundings. Which compound is a higher energy level? Explain your answer. 37 3.38 In a chemical reaction, compound C is convert to compound D. In the process, energy is relea into the surroundings. Which compound is at a higher energy level? Explain your answer Referring to Problems 13.37 and 13.38, which reaction is exothermic and which is endothermic? Justify your answer, and describ which reaction could be used to supply heat ar which could be used to "supply cold" (which actually means to remove heat) 13.39 13.4 A reaction occurs in which 1 mole of A is converted to 1 mole of B. If 1 mole of A has an energy content of 20 kJ and 1 mole of B has an energy content of 60 kJ, is this reaction exothermic or endothermic? Calculate Enn 13.4 lu of quantity) - (initial value of quantity). Now consider the quantity Enn (a) For the forward reaction R P, is AErn EReactants Eproducts? Explain your = EReactants-EProducts? Explain your answer. we (b)According to your answer to (a), what does mean when AEnn for a reaction is negative? The reaction of Problem 13.40 is run in the reverse direction (P R) a) Is it exothermic or endothermic? (b) Calculate Ern., calculated for i what you iust said and calculated for (a) andExplanation / Answer
13.40) 1 mole A is converted to 1 mole B as below:
A (1 mole, 20 kJ) ------> B (1 mole, 60 kJ)
The heat of reaction = (energy content of B) – (energy content of A) = (60 kJ) – (20 kJ) = 40 kJ
Therefore, Erxn = 40 kJ
Therefore, A has lower energy content than B and extra energy must be supplied (40 kJ) from outside so that A can be converted to B. Therefore, A absorbs energy and hence the reaction is endothermic (ans).
13.42) Now, the reaction is
B (1 mole. 60 kJ) ------> A (1 mole, 20 kJ)
a) Now the reactant (B) has more energy than the product (A). Therefore, B must release energy in order to form A. In other words, B gives out energy to the surroundings. Therefore, the reaction is exothermic.
b) Erxn = E (final value) – E (initial value) = (20 kJ) – (60 kJ) = -40 kJ (ans).
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