Question

Dettol, an antiseptic liquid, is a strong germ killer that protests your family. A label on a 500 mL Dettol bottle, indicated Chloroxylenol is 4.8 g/100 mL. How many molecules of Chloroxylenol are in 25.5 cm3 of Dettol?

Answer 1

Concentration of Chloroxylenol is `4.8 "g""/"100 mL`

That is, `100ml` or `100 cm^3` contains `4.8g` Chloroxylenol.

Since, `100 cm^3 -> 4.8g`
`color(white)(since)` `25.5cm^3 -> ?`

`=> (4.8 xx 25.5)/100 =1.22g`

Chloroxylenol has formula, `C_8H_9OCl`

therefore, it's molar mass is `156.5`

Molecules of Chloroxylenol in `25.5 cm^3` of Dettol = `"given mass"/"molar mass" xx "avogrado number"`

= `1.22/156.5 xx 6.022 xx 10^23 = 4.7 xx 10^21`