Answer to Question #345845 in General Chemistry for Meg

Question #345845

Write half-reactions for each of the following redox reactions. Identify each half-reaction as being either oxidation or reduction. Show your work.


A. SnS2(s) + O2(g) —> SnO2(s) + SO2(g)


B. Mg(s) + N2(g) —> Mg3N2(s)



1
Expert's answer
2022-05-31T11:42:04-0400

Solution:

(A):

Unbalanced chemical equation: SnS2(s) + O2(g) → SnO2(s) + SO2(g)

Oxidation half-reaction:

S2− − 2e → S4+

Reduction half-reaction:

O20 + 4e→ 2O−2

Net reaction:

2S2− + O20 → 2S4+ + 2O−2

Balanced chemical equation: SnS2(s) + 3O2(g) → SnO2(s) + 2SO2(g)


(B):

Unbalanced chemical equation: Mg(s) + N2(g) → Mg3N2(s)

Oxidation half-reaction:

Mg0 − 2e → Mg2+

Reduction half-reaction:

N20 + 6e→ 2N−3

Net reaction:

3Mg0 + N20 → 3Mg2+ + 2N−3

Balanced chemical equation: 3Mg(s) + N2(g) → Mg3N2(s)


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