Asample of ammonia has a mass of 43.5 g. how many molecules are in this sample?

Mass of ammonia sample is 43.5 g. The molecular formula of ammonia is . The molecular formula is 17.031 g/mol.

To calculate the number of molecules of ammonia, first calculate the number of moles as follows:

Here, m is mass and M is molar mass, putting the values,

Now, in mole there are molecules, this is known as Avogadro's number.

Since,

Thus,

Therefore, number of molecules in the sample will be