Question

NEED HELP IN MATH :)

Answer 1

$\dfrac{3.4\cdot10^{-25}}{1.7\cdot10^{-27}}=\dfrac{3.4}{1.7}\cdot10^{-25-(-27)}\\\\=2\cdot10^{-25+27}=2\cdot10^2=2\cdot100=200$
A lead atom has about 200 times more mass.

Used:
$\dfrac{a^n}{a^m}=a^{n-m}$