# Where is the molecule number?

## Where is the molecule number?

You will know the number atoms in the molecule by looking at the subscripts written directly after each letter. Since no number was written after Carbon, we know there is 1 atom of Carbon in this molecule.

## What’s the number of atoms in a molecule?

Molecule: group of two or more atoms held together by chemical bonds. So, minimum 2 atoms are required to form a molecule.

Why is it called a mol?

It is named after the 19th-century Italian physicist Amedeo Avogadro, who found that under the same temperature and pressure, two gases with the same volume have the same number of molecules. It was the French physicist Jean Perrin who in the early 20th century dubbed the amount of units in a mole as Avogadro’s number.

How do you find atoms in a molecule?

Converting to moles is fairly easy because the conversion is always the same. A mole is 6.022 × 1023 of something, and this number is referred to as Avogadro’s number. In chemistry, this is: # of moles × Avogadro’s number = # of atoms or molecules.

### How to calculate the number of molecules in a compound?

LightFieldStudios/iStock/GettyImages. In chemistry, a mole is a quantity unit that stands for the amount of a given substance. Since one mole of any chemical compound always contains 6.022 x 10^23 molecules, you can calculate the number of molecules of any substance if you know its mass and its chemical formula.

### Why do you need to know the number of molecules?

You need to know the number of molecules and how this relates to mass since, more often than not, when you make a solution, you are weighing out the component in question. For example, you do not count the individual number of molecules you need in a salt solution.

How to calculate the number of molecules in NaCl?

To figure this out, you will need the molar mass of NaCl which is 58.44 g/mol. First, convert the grams to moles using the molar mass and then use Avogadro’s number to find the number of molecules: This calculation tells you that there are 2.1 x 10 22 molecules of NaCl in 2 grams of NaCl.

How to calculate the number of molecules in a salt solution?

For example, you do not count the individual number of molecules you need in a salt solution. Instead you weigh out the amount of solute that corresponds to the number of molecules you want. The mole allows a bridge between the unfathomable world of huge numbers of tiny molecules and being able to actually weigh substances out and work with them.