Question

Which of the following statements is incorrect?

• A. One mole of carbon contains Avogadro's number of atoms.
• B. One mole of oxygen gas contains Avogadro’s number of atoms.
• C. One mole of neon contains Avogadro’s number of atoms.
• D. Number of moles = $\frac{\mathrm{Given}\mathrm{mass}}{\mathrm{Gram}\mathrm{molecular}\mathrm{mass}}$

Answer 1

The correct option is B One mole of oxygen gas contains Avogadro’s number of atoms.

$\bullet$ One mole is defined as the amount of substance containing as many elementary entities (atoms, molecules, ions, electrons, radicals, etc.) as there are atoms in 12 grams of carbon-12.
$\bullet$ One mole contain Avogadro's number of particles i.e. $6.022\times {10}^{23}$ particles.
$\bullet$ Oxygen gas consist of $6.022\times {10}^{23}$molecules, and one molecule contains 2 oxygen atoms. So total number of oxygen atoms present in one mole of oxygen gas is twice the Avogadro's number.