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What are the coefficients needed to balance the equation below?
_AgI + _Na2S → _Ag2S + _NaI

A 2, 1, 1, 2

The balanced equation is 2AgI + Na2S → Ag2S + 2NaI, showing 2Ag, 2I, 2Na, and 1S on both sides of the arrow. The answer choice is 2, 1, 1, 2.

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