# What is the mass fraction of mercury and oxygen in bivalent mercury oxide?

The mass fraction of mercury and oxygen in bivalent mercury oxide is as follows, first we write the formula for bivalent mercury oxide, which looks like this:

НgO

Further, to calculate the mass fraction of oxygen in bivalent mercury oxide, we use the following formula:

W = (n × Ar × 100%) / Mr

Where W is the mass fraction of the substance,

n is the number of atoms in a molecule,

Ar is the relative atomic mass of the element,

Mr is the relative molecular weight of the entire substance.

Further oxygen Ar

Ar (O) = 16

then we calculate the relative molecular weight of the whole substance:

Mr (HgO) = 201 + 16 = 217

Next, Substitute all known values into the formula and get the following solution:

W (O) = 16 × 100% / 217 = 7.37%

Next, we calculate the mass fraction of mercury

W (Hg) = 100% – 7.37% = 92.63%