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ID: past-exam-of-the-chemistry-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2024/paper-1/6/d/solution

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Past exam of the chemistry course of the year 1 of the natural sciences course of the University of Cambridge / 2024 / Paper 1 / 6 / d / Solution by

Codex  0 2026-10-20

Balancing Hg first, then sulfur, carbon and nitrogen gives

2Hg (SCN)_{2} (s) ⟶ 2HgS (s) + C S_{2} (g) + C_{3} N_{4} (s) .

(1)

There are two Hg, four S, four C and four N atoms on each side. This is the stipulated initial decomposition, not a claim that further heating cannot change its products.

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