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13 July, 18:23

The concentration of the alkane in a particular sample of rainwater is 0.2 ppb. assume that the density of rainwater is close to 1.00 g/ml and find the molar concentration of

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  1. 13 July, 20:47
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    Ppb stands for parts per billion 10⁻⁹.

    M (C₂₀H₄₂, alkane) = 282,55 g/mol.

    V (C₂₀H₄₂) = 1000 ml = 1 dm³.

    m (C₂₀H₄₂) = 2·10⁻⁷ g.

    n (C₂₀H₄₂) = m (C₂₀H₄₂) : M (C₂₀H₄₂).

    n (C₂₀H₄₂) = 2·10⁻⁷ g : 282,55 g/mol.

    n (C₂₀H₄₂) = 7,07·10⁻¹⁰ mol.

    c (C₂₀H₄₂) = n (C₂₀H₄₂) : V (C₂₀H₄₂).

    c (C₂₀H₄₂) = 7,07·10⁻¹⁰ mol/dm³.
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