the mass of Mercury oxide required to produce 18 gram of oxygen by thermal decomposition

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Solution

Dear student,

The thermal decomposition reaction of HgO forms Hg with oxygen gas. It can be written as:
2 HgO --> Hg + O₂
Given:
Mass of oxygen = 18 g
Molar mass of oxygen = 32.0 g/mol
Moles of oxygen = mass / molar mass
= 18 g / 32.0 g/mol
= 0.5625 moles

According to balanced chemical reaction:

1 moles of oxygen is formed from = 2 mole of HgO
0.5625 moles of oxygen will be formed from = ( 2/1 ) x 0. 5625 = 1.125 moles of HgO

Molar mass of HgO = 216.59 g/mol

Mass of HgO = Moles x molar mass = 1.125 moles x 216.59 g/mol = 243.7 g of HgO

Answer = 243.7 g of HgO is needed.

Regards

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