1 mole HgO = 216.59g HgO = 6.022 x 1023 molecules HgO
64.0g HgO x (1mol HgO/216.59g HgO) x (6.022 x 1023 molecules HgO/mol HgO) = 1.78 x 1023 molecules HgO
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55.8 grams
The Roman numeral for HgO is not applicable. Roman numerals are typically used for representing numbers rather than chemical formulas. HgO is the chemical formula for mercury(II) oxide.
To determine how many moles of mercury (II) oxide (HgO) are needed to produce 125 g of oxygen (O₂), we first need to consider the decomposition reaction: 2 HgO(s) → 2 Hg(l) + O₂(g). From this equation, we see that 2 moles of HgO produce 1 mole of O₂. The molar mass of O₂ is approximately 32 g/mol, so 125 g of O₂ corresponds to about 3.91 moles (125 g ÷ 32 g/mol). Therefore, since 2 moles of HgO produce 1 mole of O₂, we need 7.82 moles of HgO (3.91 moles O₂ × 2 moles HgO/mole O₂).
Mercury(II) oxide (HgO) is not thermally stable and will decompose upon heating to produce mercury and oxygen gas.
Mercury oxide (HgO) is considered to be toxic.