Question

what is the number of molecules in 0.25 moles of oxygen

Answer 1

Given :

moles of oxygen = 0.25

To Find :

number of molecules in 0.25 moles of oxygen

Solution :

1 mole of oxygen contains 6.022 * $10^{23}$ molecules

0.25 mole of oxygen will contain 6.022 * $10^{23}$ * 0.25 molecules

                                                    = 1.5055 * $10^{23}$ molecules.

∴ The number of molecules in 0.25 moles of oxygen is 1.5055 * $10^{23}$ .

Answer 2

The number of molecules in the 0.25 oxygen molecule is:

• 0.25 the oxygen molecule contains

• = 6.022 × 1023 × 0.25

• = 6.022 × 10 23 × 0.25

• = 1.505 × 1023

• = 1.505 × 10 23 molecules.

• Thus,0.25 oxygen mole contains

• 1.505 × 1023 1.505 × 10 23 molecules.

• Number of mole = 1.

• Atomicity is the number of atoms in a molecule.

• Atomicity of O2 = 2.

• So the answer is 12.044 * 10 ^ 23 atoms exist in one O2 mole.