19. Which of the following chemical equation is not balanced? 1. 3Fe +4H_2O ----- Fe_3O_4+4H_2O 2.4NH_3+8O_2------ 4NO+ 6H_2O 3. 4Na + O_2------ 2Na_2O

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Balance the following reaction

$3 F e$ + $4 H_{2} O$ $\to$ $F e_{3} O_{4}$ + $_H_{2}$

$3 F e + 4 H_{2} O \to F e_{3} O_{4} + y H_{2}$

Fill in the blank with a number which balances the following reaction.

$3 F e + 4 H_{2} O \to F e_{3} O_{4} + y H_{2}$

In the following reaction,
$3 F e$ + $4 H_{2} O$ $\to$ $F e_{3} O_{4}$ + $d H_{2}$ .
Find the value of d.

3 F e + 4 H_{2} O \to F e_{3} O_{4} + 4 H_{2}

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