Magnesium react with water and phenolthalein, balance chemical equation?

Mg + 2H2O + 2Phenolthalein -> Mg(OH)2 + 2H2 + 2Phenolthalein

Unbalanced chemical equation:

```
Mg + H2O + C20H14O4 → MgO + H2 + C20H12O4
```

Balanced chemical equation:

```
2Mg + 2H2O + C20H14O4 → 2MgO + 2H2 + C20H12O4
```

Explanation:

- Magnesium (Mg): We start with 1 Mg atom on the left side and must balance it with 2 Mg atoms on the right side.
- Water (H2O): We start with 1 H2O molecule on the left side and must balance it with 2 H2O molecules on the right side.
- Phenolphthalein (C20H14O4): Phenolphthalein is not consumed or produced in the reaction, so it remains unchanged on both sides.
- Magnesium oxide (MgO): We start with no MgO molecules on the left side and must balance it with 2 MgO molecules on the right side.
- Hydrogen (H2): We start with no H2 molecules on the left side and must balance it with 2 H2 molecules on the right side.