When the equation fe+s --> fe2s3 is balanced, what is the coefficient for sulfur?

3

Explanation:

To balance the equation, you need the same number of each atom on both the left and right sides of the equation.

The balanced equation would be:

2 Fe  +  3 S   --->    Fe2S3

You then have:

2 Fe on both sides

3 S on both sides

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