Consider the Reaction -The Mass Balance Equation for Fractional Surface Coverage of A_ads

Consider the reaction $$\begin{array} { l } P _ { s o l }\underset { k _ { - 1 } } { \stackrel { k _ { 1 } } { \rightleftarrows } }Q _ { - s o l } + e ^ { - } \\A _ { s ol } ^ { - } \underset { k _ { - 2 } } { \stackrel { k _ { 2 } } { \rightleftarrows } } A _ { a d s } + e ^ { - } \\\end{array}$$

-The mass balance equation for fractional surface coverage of A_ads is given by

A) $$\Gamma \frac { d \theta } { d t } = k _ { 1 } \left[ P _ { s d } \right] - k _ { - 1 } \left[ Q _ { s ol } \right] + k _ { 2 } \left[ A _ { s o l } ^ { - } \right] - k _ { - 2 } \theta$$
B) $$\Gamma \frac { d \theta } { d t } = k _ { 2 } \left[ A _ { s d } ^ { - } \right] ( 1 - \theta ) - k _ { - 2 } \theta$$
C) $$\Gamma \frac { d \theta } { d t } = k _ { 1 } \left[ P _ { s o l } \right] ( 1 - \theta ) - k _ { - 1 } \left[ Q _ { s o l } \right] \theta + k _ { 2 } \left[ A _ { s o l } ^ { - } \right] ( 1 - \theta ) - k _ { - 2 } \theta$$
D) $$\Gamma \frac { d \theta } { d t } = k _ { 2 } \left[ A _ { s ol} ^ { - } \right] - k _ { - 2 } \theta$$

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