For the reaction Cu2S(s)⇌2Cu+(aq)+S2−(aq)Cu2S(s)⇌2Cu +(aq)+S2−(aq), the equilibrium concentrations are as follows: [Cu+]=1.0×10−5[Cu+]=1.0×10−5 M, [S2−]=1.0×10−2[S2−]=1.0×10−2 M. The equilibrium constant is:

1x10⁻¹²

Explanation:

At equilibrium:

The equilibrium constant for the the reaction can be written as:

[Cu⁺] is squared because it has a stoichiometric coefficient of 2 in the reaction. Cu₂S has no effect on the constant because it is a solid.

Now we can calculate the equilibrium constant:

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the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.