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25 September, 03:39

What are the coefficients that belong in the blanks to balance the following chemical equation?

__ Silver (I) Iodide + __ Sodium sulfide - -> __ Silver (I) sulfide + __ Sodium Iodide

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  1. 25 September, 06:24
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    2AgI + 1Na₂S ⟶ 1Ag₂S + 2NaI

    Explanation:

    silver (I) iodide + sodium sulfide ⟶ silver (I) sulfide + sodium iodide

    1. Convert the word equation to a chemical equation:

    AgI + Na₂S ⟶ Ag₂S + NaI

    2. Put a 1 in front of the most complicated-looking formula (Na₂S?):

    AgI + 1Na₂S ⟶ Ag₂S + NaI

    3. Balance Na:

    We have fixed 2 Na on the left. We need 2 Na on the right. Put a 2 in front of NaI.

    AgI + 1Na₂S ⟶ Ag₂S + 2NaI

    4. Balance S:

    We have fixed 1 S on the left. We need 1 O on the right. Put a 1 in front of Ag₂S.

    AgI + 1Na₂S ⟶ 1Ag₂S + 2NaI

    5. Balance Ag:

    We have fixed 2Ag on the right. We need 2 Ag on the left. Put a 2 in front of AgI.

    2AgI + 1Na₂S ⟶ 1Ag₂S + 2NaI

    Every formula now has a coefficient. The equation should be balanced.

    6. Check that atoms balance:

    Atom On the left On the right

    Ag 2 2

    I 2 2

    Na 2 2

    S 1 1

    The balanced equation is

    2AgI + 1Na₂S ⟶ 1Ag₂S + 2NaI
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