Number of atoms in oxygen

Have you ever wondered how many molecules or atoms are in a drop of water? This is a common chemistry problem students solve because it deals with several important concepts, including chemical formulas, unit conversions, volume, mass, density, using the periodic table, the mole, and Avogadro’s number.

Here is a step-by-step guide for the calculation.

1. Use the chemical formula of water to find the mass of one mole of water.
2. Use the density of water to find the mass per unit volume.
3. Multiply mass per unit volume by the volume of a water drop to find the mass per drop.
4. Convert from grams to moles to get moles of water per drop.
5. Use Avogadro’s number to find the number of molecules of water per drop.
6. Multiply the number of molecules times the number of atoms per molecule to find the number of atoms in a drop of water.

The average water droplet is 0.05 mL of volume.

There are over 1.5 sextillion (10²¹) molecules in a drop of water and over 5 sextillion atoms in the drop.

How Big Is a Drop of Water?

Defining the volume of a drop of water is the first part of t

number of oxygen atoms in water

total number of atoms in water