Answer:
37.94 × 10²³ molecules of ammonia.
Explanation:
Given data:
Mass of ammonia = 107.1 g
Number of molecules = ?
Solution:
First of all we will calculate the number of moles of ammonia.
Number of moles = mass/molar molar mass
Number of moles = 107.1 g/ 17 g/mol
Number of moles = 6.3 mol
Now we will use the Avogadro number to calculate the number of molecules.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
6.3 mol × 6.022 × 10²³ molecules / 1mol
37.94 × 10²³ molecules of ammonia.
