what is the molarity of  a solution that contains 3.0 g of KNO3 in 0.625L of a solution?

Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter3: Composition Of Substances And Solutions
Section: Chapter Questions
Problem 70E: What mass of a 4.00% NaOH solution by mass contains 15.0 g of NaOH?
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what is the molarity of  a solution that contains 3.0 g of KNOin 0.625L of a solution?

Expert Solution
Step 1 To Calculate

Given, amount of KNO3 =3.0 gvolume of solution =0.625 Lwe are asked to calculate the molarity of the solution.

Step 2

The molarity of solution is given by,Molarity of solution =wM×V(in L) ; where, w is given mass of solute,M is molar mass of solute and V is the volume of the solution.Now, Molarity of solution =wM×V(in L)Molarity of solution =3.0 g101.10  gmol ×0.625 LMolarity of solution =3.063.187 molLMolarity of solution =0.047 molLMolarity of solution =0.047 M

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