Question

What is the calculated value of the cell potential at ( 298 mathrm{~K} ) for an electrochemical cell with the following reaction, when the ( mathrm{Hg}^{2+} ) concentration is ( 2.96 imes 10^{-4} mathrm{M} ) and the ( mathrm{Zn}^{2+} ) concentration is ( 1.39 mathrm{M} ) ? [ egin{array}{l} mathrm{Hg}^{2+}(a q)+mathrm{Zn}(s) ightarrow mathrm{Hg}(l)+mathrm{Zn}^{2+}(a q) \ egin{array}{|l|l|} mathrm{Hg}^{2+}(a q)+2 e^{-} ightarrow mathrm{Hg}(l) & E_{mathrm{red}}^{o}=0.855 mathrm{~V} \ hline mathrm{Zn}^{2+}(a q)+2 e^{-} ightarrow mathrm{Zn}(s) & E_{mathrm{red}}^{o}=-0.763 mathrm{~V} \ hline end{array} end{array} ] [ E_{ ext {cell }}= ] The cell reaction as written above is spontaneous for the concentrations given: true false

          What is the calculated value of the cell potential at ( 298 mathrm{~K} ) for an electrochemical cell with the following reaction, when the ( mathrm{Hg}^{2+} ) concentration is ( 2.96 	imes 10^{-4} mathrm{M} ) and the ( mathrm{Zn}^{2+} ) concentration is ( 1.39 mathrm{M} ) ?
[
egin{array}{l}
mathrm{Hg}^{2+}(a q)+mathrm{Zn}(s) 
ightarrow mathrm{Hg}(l)+mathrm{Zn}^{2+}(a q) \
egin{array}{|l|l|}
mathrm{Hg}^{2+}(a q)+2 e^{-} 
ightarrow mathrm{Hg}(l) & E_{mathrm{red}}^{o}=0.855 mathrm{~V} \
hline mathrm{Zn}^{2+}(a q)+2 e^{-} 
ightarrow mathrm{Zn}(s) & E_{mathrm{red}}^{o}=-0.763 mathrm{~V} \
hline
end{array}
end{array}
]
[
E_{	ext {cell }}=
]
The cell reaction as written above is spontaneous for the concentrations given:
true
false

What is the calculated value of the cell potential at ( 298 mathrm K ) for an electrochemical cell with the following reaction, when the ( mathrmHg^2+ ) concentration is ( 2.96 imes 10^-4 mathrmM ) and the ( mathrmZn^2+ ) concentration is ( 1.39 mathrmM ) ?
[
eginarrayl
mathrmHg^2+(a q)+mathrmZn(s)
ightarrow mathrmHg(l)+mathrmZn^2+(a q) eginarray|l|l|
mathrmHg^2+(a q)+2 e^-
ightarrow mathrmHg(l) Emathrmred^o=0.855 mathrm V hline mathrmZn^2+(a q)+2 e^-
ightarrow mathrmZn(s) Emathrmred^o=-0.763 mathrm V hline
endarray
endarray
]
[
E ext cell =
]
The cell reaction as written above is spontaneous for the concentrations given:
true
false

Added by Dee W.

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