Question

when mercury (II) oxide is heated it decomposes into mercury and oxygen gas how many molecules of oxygen gas are produced if 23.0g of mercury (II) oxide are heated

Answer 1

Answer;

= 3.1966 × 10^22 molecules of Oxygen

Explanation;

The equation for the reaction is;

2 HgO → 2 Hg + O2

Given 23 g of HgO ;

Moles of HgO = 23 / 216.6 g/mol

= 0.1062 moles

Mole ratio; HgO : O2 = 2 : 1

Thus; moles of Oxygen = 0.1062 moles/2

= 0.0531 moles

But; 1 mole of oxygen = 6.02 × 10 ^23 molecules

Therefore; molecules of oxygen produced

= 6.02 × 10^23 molecules × 0.0531 moles

= 3.1966 × 10^22 molecules