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Molarity

Average human...

Question

Average human blood serum contains $18$ mg of $K^{+}$ and $365$ mg of $C l^{-}$ per $100$ mL. The molar concentration for $C l^{-}$ ion is $y \times 10^{- 3} M$ , (density of the serum $= 1.00 g L^{- 1}$ ), then $y$ is __________.

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Solution

$100$ mL of blood serum contains $365$ mg of $C l^{-}$ .
$1 L$ or ( $1000$ mL) of blood serum will contain $3650$ mg ( $3.65$ g) of $C l^{-}$ .
The molar mass of chloride ion is $35.5$ g/mol.
The molar concentration of $C l^{-}$ will be $\frac{\frac{3.65 g}{35.5 g / m o l}}{1 L} = 0.103 M = 103 \times 10^{- 3} M$

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