Question

The mass of a single dust particle is $7.52\times {10}^{-10}$ kilogram. What is the mass of a dust ball made of $100$ dust particles?

Answer 1

The mass of a single dust particle is $7.52\times {10}^{-10}$ kilogram.

Hence, to find the mass of $100$ dust particles , we should multiply $7.52\times {10}^{-10}$ by $100$.

$=7.52\times {10}^{-10}\times 100$

$=7.52\times {10}^{-10}\times {10}^2$ (Because $100=10\times 10={10}^2$)

$=7.52\times {10}^{-10+2}$

$=7.52\times {10}^{-8}$

Hence, the mass of $100$ dust particles $=7.52\times {10}^{-8}\mathrm{kg}$