Answer: [A]: " Hg and S₈ " .
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In the given chemical reaction:
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8 Hg + S₈ ⟶ 8 HgS ;
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There are 2 (two) reactants—which are:
" Hg [mercury] " and "S " [sulfur] .
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Note: There is 1 (one) product in the given reaction— which is:
" HgS " [mercury sulfide].
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Note that within a given written chemical reaction:
1) The "reactant(s)" is/are listed on the "left-hand side" of the
"forward arrow" .
2) The "product(s)" is/are listed on the "right-hand side" of the
"forward arrow."
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Hope this answer is helpful to you!
Best wishes in your academic endeavors
— and within the "Brainly" community!
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