Verified answer

Hello!

Let's go by part, the volume of the final solution ( Vf ) is :

initial volume + final volume = 800 mL + 1000 mL = 1800 mL, ( that is, it has 800 mL and another 1000 mL was added

Initial volume (Vi) = 800 mL

Initial molarity ( Mi ) = is what we will have to find

Final molarity ( Mf ) which is the concentration that was decreased after adding more solvent to the solution = 10 mol/L

We then use the dilution calculation:

Mi = Vi = Mf × Vf

Mi = 800 = 10 × 1800

Mi = 800 = 18000

Mi = 18000 / 800

Mi= 22.5 mol/L

The correct answer is c) 22.5 mol/L

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