Question

​​​​​One mole of oxygen molecule has:

• A. $12.04\times {10}^{23}$ atoms
• B. $6.02\times {10}^{23}$ molecules
• C. 32 g oxygen
• D. $6.02\times {10}^{22{}^{}}\mathrm{molecules}$

Answer 1

Answer: (A), (B), (C)

The correct options are
A $12.04\times {10}^{23}$ atoms
B $6.02\times {10}^{23}$ molecules
C 32 g oxygen

$\bullet$ One mole of any compound contains $6.02\times {10}^{23}$ molecules.

$\bullet$ Every oxygen molecule contains two oxygen atoms.
$\therefore$ Number of atoms present in one mole of oxygen = 2 $\times 6.02\times {10}^{23}$ = 12.04 $\times {10}^{23}$ atoms.

$\bullet$ Gram molecular mass of a compound is the sum of gram atomic mass of its contituent atoms.
Gram atomic mass of oxygen (O) is 16 g.
Thus, gram molecular mass of oxygen ($O_2$) = 16+16 = 32 g.