Consider a Reaction Given By
-In the Same Mechanism, the Steady-State Fractional Surface Coverage

Consider a reaction given by $\begin{array} { l } M \underset { k _ { - 1 } } { \stackrel { k _ { 1 } } { \rightleftarrows } } M _ { a ds } ^ { + } + e ^ { - } \\M _ { a d s } ^ { + }\underset { k _ { - 2 } } { \stackrel { k _ { 2 } } { \rightleftarrows } } M _ { sol } ^ { + }\end{array}$ .
-In the same mechanism, the steady-state fractional surface coverage of the intermediate is given by

A) $$\theta _ { ss } = \frac { k _ { 1 { dc} } } { k _ { 1 \dot {dc } } + k _ { 2 } }$$
B) $$\theta _ { s s } = \frac { k _ { 1 d c } } { k _ { 1 \dot { dc } } + k _ { - 1 \dot { dc } } + k _ { 2 } + k _ { - 2 } }$$
C) $\theta_{ss}=\frac{k_{1 d c}+k_{-2} C_{M^{+2}_{sol}}}{k_{1 d c}+k_{-1 d c}+k_{2}+k_{-2} C_{M^{+2}_{sol}} }$
D) $$\theta _ { ss } = \frac { k _ { 1 \dot { dc } } - k _ { - 1 \dot { dc } } } { k _ { 1 \dot { dc } } + k _ { - 1 \dot { dc } } + k _ { 2 } + k _ { - 2 } C _ { M _ { 2a i } ^ { 2+ } } }$$