91. The reaction 2H2S(g)2H2(g)+S2(g)Kc=1.67×107 is carried out at 800C with the

Question

91.

The reaction 2H2S(g)2H2(g)+S2(g)Kc=1.67×107 is carried out at 800C with the following initial concentrations: [H2S] = 6.00×105 M ,[H2] = 0.00 M, and [S2] = 0.000 M. Part A Find the equilibrium concentration of [S2].

92.

A battery is constructed based on the oxidation of magnesium and the reduction of Cu2+. The initial concentrations of Mg2+and Cu2+ are 1.0×104 M and 1.6 M , respectively, in 1.0-liter half-cells.

Part A

What is the initial voltage of the battery?

Part B

What is the voltage of the battery after delivering 5.0 A for 8.0 h ?

Part C

How long can the battery deliver 5.0 A before going dead?

92.

A battery is constructed based on the oxidation of magnesium and the reduction of Cu2+. The initial concentrations of Mg2+and Cu2+ are 1.0×104 M and 1.6 M , respectively, in 1.0-liter half-cells.

Part A

What is the initial voltage of the battery?

Part B

What is the voltage of the battery after delivering 5.0 A for 8.0 h ?

Part C

How long can the battery deliver 5.0 A before going dead?

Explanation / Answer

91) 2H2S(g) 2H2(g) + S2(g)

Kc =1.67×10-7   T= 8000 C (1073 K)

[H2S] = 6.00×10-5 M

[H2] = 0.00 M, and [S2] = 0.000 M

(2x)2 *(x)/ ( 6.00×10-5)2 = 1.67×10-7  

x= 5.61 x 10-6 M (equilibrium concentration of S2)

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