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General Chemistry

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Critical Thinking: Predicting Spontaneity

CHEM-3FI8HI

Which of the following would result in a spontaneous reaction when performed under standard conditions?

Select ALL that apply.

For your convenience, a condensed table of standard reduction potentials has been included.

Half-reaction ${E}^{°}$ (V)
${Co}^{3+} + { e }^{ - } \xrightarrow [ ]{ } \ {Co}^{2+}$ $1.82$
${H}_{2}{O}_{2} + 2{H}^{+} + 2{ e }^{ - } \xrightarrow [ ]{ } 2{H}_{2}O$ $1.77$
$4{H}^{+} + {O}_{2} + 4{ e }^{ - } \xrightarrow [ ]{ } 2{H}_{2}O$ $1.23$
${Br}_{2} + 2{ e }^{ - } \xrightarrow [ ]{ } \ 2{Br}^{-}$ $1.07$
${I}_{2} + 2{ e }^{ - } \xrightarrow [ ]{ } \ 2{I}^{-}$ $0.53$
$2{H}^{+} + 2{ e }^{ - } \xrightarrow [ ]{ } \ {H}_{2}$ $0.00$
${Co}^{2+} + 2{ e }^{ - } \xrightarrow [ ]{ } \ Co$ $-0.28$
$2{H}_{2}O + 2{ e }^{ - } \xrightarrow [ ]{ } \ {H}_{2} + 2O{H}^{-}$ $-0.83$
${Al}^{3+} + 3{ e }^{ - } \xrightarrow [ ]{ } \ Al$ $-1.66$
${Ba}^{2+} + 2{ e }^{ - } \xrightarrow [ ]{ } Ba$ $-2.91$
A

A piece of $Al$ metal is placed in a solution of ${Ba({NO}_{3})}_{2}$.

B

An acidic solution of ${CoCl}_{2}$ is exposed to air.

C

Crystals of ${I}_{2}$ are added to a solution of $NaBr$.

D

None of the above are correct.