Question

What weight of $80$% pure sulphur is required to produce $64$ kg of $S{O}_2$?

• A. $32$ kg
• B. $40$ kg
• C. $25.6$ kg
• D. $64$ kg

Answer 1

The correct option is B $40$ kg

$S+O_2\to S{O}_2$
$64$ kg $S{O}_2$ requires $32$ kg pure sulphur
We know that, $80$ kg pure sulphur is present in $100$ kg of sulpur sample
So $32$ kg sulphur is present in $\frac{100\times 32}{80}$ kg sample $=40$ kg