Which coefficients are needed to correctly balance this equation? HgO­­­­→?O2+?Hg 2,1,2 2,3,1 3,2,2 1,3,1

To balance the chemical equation \( \text{HgO} \rightarrow \text{O}_2 + \text{Hg} \), we need to ensure that the number of atoms of each element is the same on both sides of the equation.<br /><br />1. **Count the atoms on each side:**<br /> - On the left side, we have 1 Hg and 1 O in HgO.<br /> - On the right side, we have O in \( \text{O}_2 \) and Hg as a separate element.<br /><br />2. **Balance the oxygen atoms:**<br /> - Since \( \text{O}_2 \) has 2 oxygen atoms, we need 2 HgO molecules to provide 2 oxygen atoms. This gives us:<br /> \[<br /> 2 \text{HgO} \rightarrow \text{O}_2 + 2 \text{Hg}<br /> \]<br /><br />3. **Check the mercury atoms:**<br /> - With 2 HgO molecules, we have 2 Hg atoms on the left, which balances with the 2 Hg atoms on the right.<br /><br />The balanced equation is:<br />\[ 2 \text{HgO} \rightarrow \text{O}_2 + 2 \text{Hg} \]<br /><br />Thus, the coefficients needed are 2 for HgO, 1 for \( \text{O}_2 \), and 2 for Hg. Therefore, the correct answer is:<br /><br />2, 1, 2