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31 July, 04:40

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

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  1. 31 July, 04:55
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    [ 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 ] =
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