Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:2. To what volume must you dilute 12.6 g NaBr to prepare a 0.250 M NaBr solution?
3. Treatment of a 0.3392 g sample of impure potassium chloride with an excess of
AGNO3 resulted in the formation of 0.2246 g of AgCI (s).
a. How many grams of potassium chloride were in the sample?
b. What is the weight percentage of KCl in the sample?
Expert Solution

Molar concentration
Molar concentration or molarity is a concentration term. It is a measure of amount of solute in a solution.
It can be mathematically represented as :
Molarity(M) = number of moles of solute(n) /volume of solution in litres(V)
M= n/V ••••••(1)
Unit of molarity is molar written as M. 1 molar is equivalent to 1 mol/L
1 M = 1 mol/L
Molarity = 0.250 M = 0.250 mol/L
Number of moles are related to mass and molar mass as follows :
Number of moles (n) = mass(m) /molar mass(M)
n = m/M •••••(2)
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