How can we calculate the mass of one mole of polydimethylsiloxane?

In other words, what is the mass of 6.022 × 10²³ polydimethylsiloxane molecules

?

A chemical compound consists of atoms combined together.

For example, polydimethylsiloxane consists of many molecules.

Each molecular unit described here contains

two carbon atoms, six hydrogen atoms, one oxygen atom, and one silicon atom.

How can we calculate the mass of one mole of polydimethylsiloxane?

What is the mass of 6.022 × 10²³ polydimethylsiloxane molecules?

Since each polydimethylsiloxane molecular unit

contains two carbon atoms, six hydrogen atoms, one oxygen atom, and one silicon atom,

one mole of these units

contains two moles of carbon, six moles of hydrogen, one mole of oxygen, and one mole of silicon.

The mass of one mole of these polydimethylsiloxane units

is obtained by adding the masses of carbon, hydrogen, oxygen, and silicon:

Mass of 2 moles of carbon = 12 g × 2 = 24 g

Mass of 6 moles of hydrogen = 1.008 g × 6 = 6.048 g

Mass of 1 mole of oxygen = 16 × 1 = 16 g

Mass of 1 mole of silicon = 28.09 × 1 = 28.09 g

Mass of 1 mole of polydimethylsiloxane = 104.138 g (the molar mass stated in the source)