For the reaction of ethylene represented above, H is - 1,323 kJ. What is the value of H if the combustion produced liquid water H2O(l), rather than water vapor H2O(g)? (H for the phase change H2O(g) --> H2O(l) is -44 kJ A) -1,235 kJ B) -1,279 kJ C) -1,323 kJ D) -1,367 kJ E) -1,411 kJ (31%) 2002 #25 3 C2H2(g) C6H6(g) What is the standard enthalpy change, for the reaction represented above? (ΔHof of ΔHo, C2H2(g) is 230 kJ mol-1; of C6H6(g) is 83 kJ mol-1.) ΔHof A) -607 kJ (66%) B) -147 kJ C) -19 kJ D) +19 kJ E) +773 kJ Of the following reactions, involves the largest decrease in entropy? 1999 #22 A) CaCO3(s) ---> CaO(s) + CO2(g) B) 2 CO(g) + O2(g) ---> 2 CO2 C) Pb(NO3)3 + 2 KI ---> PbI2 + 2 KNO3 D) C3H8 + O2 ---> 3 CO2 + 4 H2O E) 4 La + 3 O2 ---> 2 La2O3 (68%) 2002 #41 When solid NH4SCN is mixed with solid Ba(OH)2 in a closed container, the temperature drops and a gas is produced. Which of the following indicates the correct signs for and for the process? ΔG, ΔH, ΔS ΔG ΔH ΔS A) - - - B) - + - C) - + + (43%) D) + - + E) + - - 2002 #73 X(s) X(l)
For the reaction of ethylene represented above, H is - 1,323 kJ. What is the value of H if the combustion produced liquid water H2O(l), rather than water vapor H2O(g)? (H for the phase change H2O(g) --> H2O(l) is -44 kJ A) -1,235 kJ B) -1,279 kJ C) -1,323 kJ D) -1,367 kJ E) -1,411 kJ (31%) 2002 #25 3 C2H2(g) C6H6(g) What is the standard enthalpy change, ΔHo, for the reaction represented above? (ΔHof of C2H2(g) is 230 kJ mol-1; ΔHof of C6H6(g) is 83 kJ mol-1.) A) -607 kJ (66%) B) -147 kJ C) -19 kJ D) +19 kJ E) +773 kJ 1999 #22 Of the following reactions, involves the largest decrease in entropy? A) CaCO3(s) ---> CaO(s) + CO2(g) B) 2 CO(g) + O2(g) ---> 2 CO2 C) Pb(NO3)3 + 2 KI ---> PbI2 + 2 KNO3 D) C3H8 + O2 ---> 3 CO2 + 4 H2O E) 4 La + 3 O2 ---> 2 La2O3 (68%) 2002 #41 When solid NH4SCN is mixed with solid Ba(OH)2 in a closed container, the temperature drops and a gas is produced. Which of the following indicates the correct signs for ΔG, ΔH, and ΔS for the process? ΔG ΔH ΔS A) - - - B) - + - C) - + + (43%) D) + - + E) + - - 2002 #73 X(s) X(l)
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