Problem: What is the molarity of a solution prepared by dissolving 10.7 g Nal in 0.250 L?A) 42.8 B) 0.0714 C) 2.86 x 10-4 D) 0.286 E) none of the above

FREE Expert Solution
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FREE Expert Solution

We’re being asked to calculate the molarity (M) of a solution of NaI. Recall that molarity is the ratio of the moles of solute and the volume of solution (in liters). In other words:


Molarity (M) = moles of soluteLiters of solution



We first need to determine the number of moles of NaI since this is the only information missing for us to find molarity. Notice that the volume of the solution in liters is already given.


We’re given the mass of NaI, 10.7 g. We can use the molar mass of NaI to find the moles. The molar mass of NaI is 


The moles of NaI is:


10.7 g NaI (1 mol NaI149.89 g NaI)=0.0714 mol



We know that the volume of the solution is 0.250 L. We can now calculate for molarity:


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Problem Details

What is the molarity of a solution prepared by dissolving 10.7 g Nal in 0.250 L?

A) 42.8 

B) 0.0714 

C) 2.86 x 10-4 

D) 0.286 

E) none of the above

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