How many oxygen molecules are produced when 89.5 g of mercury(II) oxide are allowed to decompose according to the following equation: 2HgO 2Hg + O2

Answer 1

2HgO ==> 2Hg + O₂ ... balanced equation

molar mass HgO = 216.6 g / mol

moles HgO present = 89.5 g HgO x 1 mol / 216.6 g = 0.4132 moles HgO

moles O₂ produced = 0.4132 mols HgO x 1 mol O₂ / 2 mols HgO = 0.2066 mols O₂ produced

Number O₂ molecules = 0.2066 mols O₂ x 6.02x10²³ molecules / mol = 3.01x10²³ molecules O₂