1
answer
0
watching
200
views
17 Nov 2019
Calculate the standard entropy change at 25 degree C for: C_3H_8(g) + 5 O_2(g) rightarrow 3 CO_2(g) + 4H_2 O(g) +877.9 J/K +100.5 J/K -72.9 J/K +72.9 J/K +2692 J/K The half-life for the spontaneous decay of iodine-131 is 8.04 days. How much of a 0.50 g sample of this remains after 3.0 days? 0.39 g 0.13 g 0.28 g 0.11 g 0.19 Assume Cu^2+(aq) + Ca(s) rightarrow Cu(s) + Ca^2+(aq) proceeds in the forward direction. We conclude: Ca(s) is oxidized and Cu^2+(aq) is reduced. Cu^2+(aq) is oxidized and Ca(s) is reduced. Ca(s) is oxidized and Ca^2+(aq) is reduced. Cu^2+(aq) is oxidized and Ca^2+(aq) is reduced. Cu(s) is oxidized and Ca(s) is reduced. Calculate the cell potential, at 25 degree C, for 3 Cr^2+(aq) + 2 Al(s) rightarrow 3 Cr(s) + 2 Al^3+(aq). Assume [Cr^2+] = 0.15 M and [Al^3+] = 0.0040 M. +0.73 V +0.44 V -2.64 V +0.77 V -0.75 V For which of the following reactions will the entropy of the system decrease? CaO(s) + CO_2 (g) rightarrow CaCO_3(s) 2 NH_3 (g) rightarrow N_2 (g) + 3 H_2(g) N_2 O_4(g) rightarrow 2 NO_2(g) KOH(s) rightarrow K^+(aq) + OH^-(aq) 2 C(s) + O_2(g) rightarrow 2 CO(g)
Calculate the standard entropy change at 25 degree C for: C_3H_8(g) + 5 O_2(g) rightarrow 3 CO_2(g) + 4H_2 O(g) +877.9 J/K +100.5 J/K -72.9 J/K +72.9 J/K +2692 J/K The half-life for the spontaneous decay of iodine-131 is 8.04 days. How much of a 0.50 g sample of this remains after 3.0 days? 0.39 g 0.13 g 0.28 g 0.11 g 0.19 Assume Cu^2+(aq) + Ca(s) rightarrow Cu(s) + Ca^2+(aq) proceeds in the forward direction. We conclude: Ca(s) is oxidized and Cu^2+(aq) is reduced. Cu^2+(aq) is oxidized and Ca(s) is reduced. Ca(s) is oxidized and Ca^2+(aq) is reduced. Cu^2+(aq) is oxidized and Ca^2+(aq) is reduced. Cu(s) is oxidized and Ca(s) is reduced. Calculate the cell potential, at 25 degree C, for 3 Cr^2+(aq) + 2 Al(s) rightarrow 3 Cr(s) + 2 Al^3+(aq). Assume [Cr^2+] = 0.15 M and [Al^3+] = 0.0040 M. +0.73 V +0.44 V -2.64 V +0.77 V -0.75 V For which of the following reactions will the entropy of the system decrease? CaO(s) + CO_2 (g) rightarrow CaCO_3(s) 2 NH_3 (g) rightarrow N_2 (g) + 3 H_2(g) N_2 O_4(g) rightarrow 2 NO_2(g) KOH(s) rightarrow K^+(aq) + OH^-(aq) 2 C(s) + O_2(g) rightarrow 2 CO(g)
Jarrod RobelLv2
4 Mar 2019