Question

Calculate the number of moles in $128g$ of $S{O}_2$ :

• A. 1mole
• B. 2 mole
• C. $3mole$
• D. $4mole$

Answer 1

The correct option is B

2 mole

The explanation for correct option:

• The molar mass of sulfur is $32g$and the molar mass of oxygen is $16g$.
• Therefore the molar mass of $$\begin{gathered} S{O}_2=32+(2\times 16) \\ =64g \end{gathered}$$
• We know the mole number is $$\begin{gathered} \frac{weightofS{O}_2}{MolarmassofS{O}_2}=\frac{128}{64} \\ =2mole \end{gathered}$$

The explanation for the incorrect options:

The given mole number is not correctly representing the mole number of $128gofS{O}_2$.