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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Chris Nielsen

Chemistry

10 January, 20:35

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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Keon Avery · Answer 1

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.