Sagot :

Mozi

Bonsoir

m = 211 ng / (2 × 10¹⁵) = 105,5 × 10⁻¹⁵ ng = 1,055 10² × 10⁻¹⁵ × 10⁻⁹ g

m = 1,055 × 10²⁻¹⁵⁻⁹ = 1,055 × 10⁻²² g