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The concentration of Mg2+ in a sample of coastal seawater is 1.09 g/kg. What is the...

The concentration of Mg2+ in a sample of coastal seawater is 1.09 g/kg. What is the molar concentration of Mg2+ in water with a density of 1.02 g/mL?

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Answer #1

concentration of Mg+2 = 1.09 g / kg

moles of Mg+2 = 1.09 / 24.3 = 0.04485 mol

mass of water = 1 kg = 1000 g

volume of water = 1000 / 1.02 = 980.39 mL

= 0.980 mL

Molar concentration = moles / volume

   = 0.04485 / 0.980

Molar concentration of Mg+2 = 0.0458 mol / L                                                         

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