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Molality and Molarity Worksheet

This document provides sample problems for calculating molarity and molality of various chemical solutions. There are 6 molarity problems that involve calculating the concentration of a solution given the mass of solute and volume of solution or finding the volume or mass of solute needed. There are also 5 molality problems that involve calculating the molality of a solution given the mass of solute and mass of water or finding the mass of water or solute needed. Students are directed to show their work and include proper units in their calculations.

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Kenneth Roy Matuguina
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669 views1 page

Molality and Molarity Worksheet

This document provides sample problems for calculating molarity and molality of various chemical solutions. There are 6 molarity problems that involve calculating the concentration of a solution given the mass of solute and volume of solution or finding the volume or mass of solute needed. There are also 5 molality problems that involve calculating the molality of a solution given the mass of solute and mass of water or finding the mass of water or solute needed. Students are directed to show their work and include proper units in their calculations.

Uploaded by

Kenneth Roy Matuguina
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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MOLARITY AND MOLALITY WORKSHEETS

Direction: Calculate what is asked in the following problems. Show your solution in the separate
sheet.
Note: Please don’t forget to write the given, required, and its proper units. Good Luck!

I. MOLARITY (30 pts.)

a. If 3.12 g of potassium fluoride (KF) is dissolved in some water to make the final volume equal
to 50.0 mL, what is the molarity of this solution?

b. What is the concentration of solution with a volume of 3.3 mL that contains 12 grams of
ammonium sulfite ( (NH₄)₂SO₃ )?

c. 120 grams of calcium nitrite ( Ca(NO2)2 ) in 240 mL of solution. Calculate its the molarity.

d. What is the concentration of a solution that has a volume of 2.5 L and contains 660 grams of
calcium phosphate ( Ca3(PO4)2 )?

e. How many liters of 4 M solution can be made using 100 grams of lithium bromide (LiBr)

f. How many grams of copper(II) fluoride ( CuF 2 )are needed to make 6.7 liters of a 1.2 M
solution?

II. MOLALITY (25 pts.)

a. What is the molality of a solution in which 13.7 g of sodium chloride (NaCl) has been
dissolved in 500 g of water?

b. What mass of sulfuric acid ( H 2SO4 ) must be dissolved to 2.40 kg H2O to produce a 1.20 m of
solution?

c. What is the molality of a solution that contains 0.500 mole of acetic acid ( HC 2H3O2 ) in 0.125
kg of H2O?

d. What is the molality of a solution that contains 80 g of aluminum sulfate ( Al 2(SO4)3 ) in 625 g
of H2O?

e. What mass of water is required to dissolve 100 g of sodium chloride (NaCl) to prepare a 1.50
m of solution?

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