To calculate the number of atoms in a given amount of a substance, you need to use the concept of moles and Avogadro's constant.
First, you need to determine the number of moles of water in 6 grams. For this, you need to know the molar mass of water, which is approximately 18 grams per mole (Hâ‚‚O consists of two hydrogen atoms with a total atomic mass of approximately 2 grams per mole and one oxygen atom with an atomic mass of approximately 16 grams per mole).
Moles = Mass / Molar Mass
Moles = 6 g / 18 g/mol ≈ 0.333 moles
Next, you can use Avogadro's constant, which is approximately 6.022 x 10^23 atoms per mole, to calculate the number of atoms in 0.333 moles of water.
Number of Atoms = Moles x Avogadro's Constant
Number of Atoms = 0.333 moles x (6.022 x 10^23 atoms/mol) ≈ 2.00 x 10^23 atoms
Therefore, there are approximately 2.00 x 10^23 atoms in 6 grams of water.