Question

A common talcum powder contains 4 % m/m zinc oxide, which acts as an antiseptic. How much zinc oxide is present in 300 g of the talcum powder?

Answer 1

Given:

Percentage of zinc oxide = 4% (m/m)

Mass of talcum powder = 300 g

Using the formula:

Mass of zinc oxide = `"Percentage"/100 xx "Total mass"`

= `4/100 xx 300`

= 12 g

12 g of zinc oxide is present in 300 g of the talcum powder.