What is the molarity of the solution, if $110$ grams of KF is dissolved in water to make $850 m l$ of solution ?

0.129 M

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0.620 M

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0.002 M

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0.068 M

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2.23 M

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Solution

The correct option is D $2.23 M$
Molarity is a unit of concentration measuring the number of moles of a solute per liter of solution.
$M o l a r i t y = \frac{M o l e o f s o l u t e}{V o l u m e o f s o l u t i o n (L)}$
$M o l e s o f K F = \frac{W e i g h t}{M o l e c u l a r w e i g h t} = \frac{110}{58} = 1.89 m o l e$
$M o l a r i t y = \frac{1.89}{850} \times 1000 = 2.23 m o l e / L = 2.23 M$

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