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Question

Find the molar concentration of MgCI2 in solution, when 190 grams of MgCI2 is dissolved in water and the total solution is 500 mL in volume?

A
4.0 M
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B
2.0 M
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C
8.0 M
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D
16.0 M
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E
12.0 M
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Solution

The correct option is A 4.0 M
Molar mass of MgCl2=24.3+2(35.5)=95.3g/mol
Number of moles is the ratio of mass to molar mass.
Number of moles of MgCl2=190g95.3g/mol=1.994mol
The molar concentration is the number of moles of solute present in 1 L of solution.
Molar concentration of MgCl2=1.994mol0.500L=4.0M

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