Question

calculate the number of moles present in 3.011 * 10 power 23 number of oxygen atom

Answer 1

We know, 1 mol of any substance contains 6.022 × 10²³ no of particles.

6.022×10²³ atoms are present in 1 mol of oxygen.

1 atom is present in 1÷6.022×10²³ mol of oxygen.

3.011×10²³ atoms are present in (1÷6.022×10²³) × 3.011×10²³ mol of oxygen.

= 0.5 mol of oxygen[Answer]

Answer 2

0.5 moles are present in  3.011 x 10²³ atoms of oxygen.

Given: Number of oxygen atoms = 3.011 x 10²³

To Find: Moles present in the given number of atoms

Solution:

1 mole of a substance contains N atoms

N is Avogadro's number

N = 6.022 x 10²³

1 mole of oxygen will also contain  6.022 x 10²³atoms

Moles present in 6.022 x 10²³ atoms = 1

Moles present in 1 atom = 1 /  6.022 x 10²³

Moles present in 3.011 x 10²³ =  (3.011 x 10²³)/ 6.022 x 10²³

                                                = 1/2

Moles present in 3.011 x 10²³ = 0.5

Therefore, 0.5 moles are present in  3.011 x 10²³ atoms of oxygen.