Complete and balance the following equation :
`Fe_3O_4+4H_2 rarr "____"+"____"`

Explanation

To complete and balance the equation `Fe3O4 + 4H2 → "____" + "____"`, we will follow these steps:

### Step 1: Identify the Reactants and Products
The reactants are iron(II,III) oxide (Fe3O4) and hydrogen gas (H2). The products of this reaction will be iron (Fe) and water (H2O).

### Step 2: Write the Unbalanced Chemical Equation
The unbalanced equation can be written as:
\[ \text{Fe}_3\text{O}_4 + 4\text{H}_2 \rightarrow \text{Fe} + \text{H}_2\text{O} \]
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