Bot GPT 4-o mini To balance the unbalanced chemical equation
\[ 2 \text{NaHCO}_3 \rightarrow \text{Na}_2\text{CO}_3 + \text{CO}_2 \]
we first analyze the molecules involved. On the left side, we have:
- 2 sodium (Na)
- 2 carbon (C)
- 6 oxygen (O)
- 2 hydrogen (H)
On the right side, we have:
- 2 sodium (Na)
- 2 carbon (C) from Na2CO3 and CO2 together
- 3 oxygen from Na2CO3 and 2 oxygen from CO2 (total of 5)
- No hydrogen (H)
To equal out the hydrogen, we need to introduce a reactant that adds hydrogen to the right side. Among the options given, H2O (water) contains hydrogen and can be used to balance the equation.
Answer: H2O
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