Number of atoms in 2 gram O2.

Answer 1

To find the number of atoms in 2 grams of O2, we need to use the concept of the Avogadro's number.

The molar mass of O2 is 32 g/mol (16 g/mol for each oxygen atom).

We can now calculate the moles of O2 by dividing the given mass (2 g) by the molar mass (32 g/mol):

moles = 2 g / 32 g/mol = 0.0625 mol

Since O2 contains 2 oxygen atoms per molecule, we can multiply the number of moles by the Avogadro's number to find the number of atoms:

number of atoms = moles * Avogadro's number = 0.0625 mol * 6.022 × 10^23 atoms/mol

Using a calculator, we find:

number of atoms ≈ 3.76375 × 10^22 atoms

Therefore, there are approximately 3.76375 × 10^22 atoms in 2 grams of O2.