To balance the equation \( __ KClO_3 \rightarrow 2 KCl + 3 O_2 \), we need to balance the number of potassium (K), chlorine (Cl), and oxygen (O) atoms on both sides.
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On the right side, we have:
- 2 K from 2 KCl
- 2 Cl from 2 KCl
- 6 O from 3 O2 (since 3 O2 has 3 × 2 = 6 O)
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To balance K and Cl, we need 2 KCl and thus, we need 2 KClO3 on the left side:
- This means we will have 2 K, 2 Cl, and 6 O in 2 KClO3.
Thus, the equation will be: \[ 2 KClO_3 \rightarrow 2 KCl + 3 O_2 \]
So, the number to fill in the blank is 2.
Answer for Blank 1: 2