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kherson [118]
3 years ago
15

What is the volume of the solution produced when enough water is added to 42.0 g of mgcl2 ⋅ 6h2o to yield a solution that has a

cl- ion concentration of 0.500m?
Chemistry
1 answer:
DENIUS [597]3 years ago
5 0

Answer:

827 mL

Explanation:

To answer this question we use the <em>definition of Molarity</em>:

Molarity = mol / L

[Cl⁻] = mol Cl⁻ / L

Now we calculate the moles of Cl⁻ present in 42.0 g of MgCl₂⋅6H₂O:

Molar mass of MgCl₂⋅6H₂O = 24.3 + 2*35.45 + 6*18 = 203.2 g/mol

moles of Cl⁻ = 42.0 g MgCl₂⋅6H₂O ÷ 203.2 g/mol * \frac{2molCl^{-}}{1molMgCl_{2}.6H_{2}O} = 0.4134 mol Cl⁻

Finally we use the definition of molarity to calculate the volume:

0.500 M = 0.4134 mol Cl⁻ / xL

xL = 0.827 L =  827 mL

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