The concentration of gallium in silicon is 5.0 * 10-7 at%. What is the concentration in kilograms of gallium per cubic meter?

[ Ga ] = 1.163 E-8 Kg/m³

Explanation:

%wt = [ (mass Ga) / (mass Si) ]*100 = 5.0 E-7 %

⇒ 5.0 E-9 = m Ga/m Si

assuming: m Si = 100 g = 0.1 Kg

⇒ m Ga = (5.0 E-9) * (0.1 Kg) = 5 E-10 Kg

∴ density (δ) Si = 2.33 Kg/m³

⇒ Volume Si = (0.1 Kg) * (m³/2.33 Kg) = 0.043 m³

⇒ [ Ga ] = (5 E-10 Kg) / (0.043 m³) = 1.163 E-8 Kg/m³

⇒ [ Ga ] =