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19 Nov 2019
Entropy and the Second Law of Thermodynamics According to the second law of thermodynamics, all reactions proceed spontaneously in the direction that increases total entropy. The total entropy is defined as AStotal system ASsurroundings The direction of a spontaneous change is always determined by the sign of the total entropy change: The reaction is spontaneous if AStotal 0 The reaction is nonspontaneous if AStotal 0. The reaction is at equilibrium if AStotal 0 The value of AS. depends on ASsystem and ASsurro which are defined by total undings, AS em. So (products) So (reactants) and AHS system AS surroun Spontaneity is therefore affected by the enthalpy of the system and the Kelvin temperature. Part A CaO can be used as a drying agent. One such application occurs when water is added to dry concrete or cement. The reaction that occurs is CaO (s) H2O() Ca(OH)2 (s) The product is commonly called slaked lime. Assuming the commonly used standard-state temperature of 25°C calculate AS for this reaction using table from total the table below. So AH Substance DJ/(K mol)] (kJ/mol) CaO(s) 635.1 39.9 H2O(l) 285.8 69.9 Ca(OH)2 (s) 83.4 -986.1 Express your answer to three significant figures and include the appropriate units. To indicate multiplication in a compound unit, use a multiplication dot (e.g., K.mol). You did not open hints for this part. ANSWER:
Entropy and the Second Law of Thermodynamics According to the second law of thermodynamics, all reactions proceed spontaneously in the direction that increases total entropy. The total entropy is defined as AStotal system ASsurroundings The direction of a spontaneous change is always determined by the sign of the total entropy change: The reaction is spontaneous if AStotal 0 The reaction is nonspontaneous if AStotal 0. The reaction is at equilibrium if AStotal 0 The value of AS. depends on ASsystem and ASsurro which are defined by total undings, AS em. So (products) So (reactants) and AHS system AS surroun Spontaneity is therefore affected by the enthalpy of the system and the Kelvin temperature. Part A CaO can be used as a drying agent. One such application occurs when water is added to dry concrete or cement. The reaction that occurs is CaO (s) H2O() Ca(OH)2 (s) The product is commonly called slaked lime. Assuming the commonly used standard-state temperature of 25°C calculate AS for this reaction using table from total the table below. So AH Substance DJ/(K mol)] (kJ/mol) CaO(s) 635.1 39.9 H2O(l) 285.8 69.9 Ca(OH)2 (s) 83.4 -986.1 Express your answer to three significant figures and include the appropriate units. To indicate multiplication in a compound unit, use a multiplication dot (e.g., K.mol). You did not open hints for this part. ANSWER:
Sixta KovacekLv2
19 Oct 2019