Question

Mass of one atom of oxygen is

• A. $16/6.023\times {10}^{23}\mathrm{g}$
• B. $32/6.023\times {10}^{23}\mathrm{g}$
• C. $1/6.023\times {10}^{23}\mathrm{g}$
• D. 8u

Answer 1

The correct option is A

$16/6.023\times {10}^{23}\mathrm{g}$

Step 1: Concept of Molecular Mass

1. The molecular mass of an element is defined as the sum of masses of the elements present in the molecule.
2. Molecular mass is obtained by multiplying the atomic mass of an element with the number of atoms in the molecule and then adding the masses of all elements in the molecule.

Step 2: Calculation of mass of one atom of Oxygen

1. Mass of one atom of oxygen= $\mathrm{Atomic}\mathrm{mass}/\mathrm{Avagadro}\mathrm{number}$
2. The atomic mass of oxygen= $16\mathrm{g}$
3. Avagadro number= $6.023\times {10}^{23}$
4. Hence the mass of one atom of oxygen= $16/6.023\times {10}^{23}\mathrm{g}$

Therefore, mass of one atom of oxygen= $16/6.023\times {10}^{23}\mathrm{g}$, Hence correct option is (A)