Final answer:
To produce 6.58 grams of O₂, we would need 3.29 grams of HgO.
Step-by-step explanation:
To find the number of grams of HgO needed, we need to use the given balanced chemical equation:
2 HgO → 2 Hg + O₂
The molar mass of HgO is 216.59 g/mol.
From the equation, we can see that 2 moles of HgO react to form 1 mole of O₂. Therefore, to produce 6.58 grams of O₂, we would need half the amount of HgO, which is 3.29 grams (Option B).