Question

When Mercury(II) oxide gas. How many molecules of oxygen gas are produced if 6.54g of mercury(ll) oxide are heated?

Answer 1

0.09 × 10²³ molecules of O₂

Step-by-step explanation:

Given data:

Mass of mercury(II) oxide = 6.54 g

Molecules of oxygen produced = ?

Solution:

Chemical equation:

2HgO → 2Hg + O₂

Number of moles of HgO:

Number of moles = mass/ molar mass

Number of moles = 6.54 g / 216.6 g/mol

Number of moles = 0.03 mol

Now we will compare the moles of HgO with oxygen.

HgO : O₂

2 : 1

0.03 : 1/2×0.03 = 0.015 mol

Number of molecules of oxygen:

1 mole of O₂ = 6.022 × 10²³ molecules of O₂

0.015 mole of O₂ :

0.015 × 6.022 × 10²³ molecules of O₂

0.09 × 10²³ molecules of O₂