Question

Calculate the number of oxygen atoms in 0.1 mole of sulphur dioxide molecules.

• A. $6.023\times {10}^{23}$
• B. $6.023\times {10}^{22}$
• C. $1.204\times {10}^{23}$
• D. $1.204\times {10}^{22}$

Answer 1

The correct option is C $1.204\times {10}^{23}$

Moles = 0.1 mol
$1mol=6.022\times {10}^{23}$ molecules
$0.1mol=6.022\times {10}^{23}\times 0.1$
$=6.022\times {10}^{22}$ molecules
$S{O}_2\to$ 1 atom of S & 2 atoms of O
1 molecules of $S{O}_2$ has 2 atoms of O
$6.022\times {10}^{22}$ molecules of $S{O}_2$ $=6.022\times {10}^{22}\times 2$
$=1.204\times {10}^{23}$ atoms of oxygen