Question

question 6 (1 point) the coefficient of fe3+ in the balanced version of al + fe3+ → al3+ + fe2+ is 1 3 5 7

Explanation:

Step1: Write half - reactions

Oxidation: $Al
ightarrow Al^{3 + }+3e^{-}$
Reduction: $Fe^{3 + }+e^{-}
ightarrow Fe^{2 + }$

Step2: Balance electrons

Multiply the reduction half - reaction by 3 to balance the electrons.
Oxidation: $Al
ightarrow Al^{3 + }+3e^{-}$
Reduction: $3Fe^{3 + }+3e^{-}
ightarrow 3Fe^{2 + }$

Step3: Combine half - reactions

$Al + 3Fe^{3 + }
ightarrow Al^{3 + }+3Fe^{2 + }$

Answer:

3