1. At constant pressure, the sign of q for the process H2O(l) ? H2O(g) is expect
ID: 1036934 • Letter: 1
Question
1. At constant pressure, the sign of q for the process H2O(l) ? H2O(g) is expected to be (a) positive, and the process is exothermic. (b) negative, and the process is endothermic. (c) impossible to predict. (d) negative, and the process is exothermic. (e) positive, and the process is endothermic. 2. Which of the following processes is/are endothermic? 1. the reaction of methane with oxygen 2. the freezing of water 3. heating copper from 25°C to 85°C (a) 1 only (b) 2 only (c) 3 only (d) 1 and3 (e) 1, 2, and 3 3. What is the change in internal energy of the system (AU) if 10 kJ of heat energy is absorbed by the system and 70 k.J of work is done by the system for a certain process? (a) -60 k.J (b) 80 kJ (c) 10 kJ (d) 60 kJ (e) -80 kJ of the mixture? The specific heat capacities of copper and water are 0.385 J/g K and 4.184 J/g.K, respectively. 4. If 46.1 g Cu at 11.6°C is placed in 85.0 g H20 at 72.4°C, what is the final temperatureExplanation / Answer
1) At constant presssure, the conversion of liquid vapour involves, addition of heat energy and hence it is an endothermic process (i.e.- positive enthalpy) and addition of heat is symbolises with +q (plus sign indicates addition of heat)
Ans- positive and the process is endothermic
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