Ch.12 - SolutionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Problem

How many grams of Na 2SO4 (142.05 g/mol) should be added to 175 mL of water to prepare a 0.555 m solution of Na 2SO4? Assume the density of water is 1.00 g/mL.

a. 201 g

b. 55.2 g

c. 13.8 g

d. 91.2 g

e. 54.2 g

Solution

We're being asked to determine the mass of Na2SO4 needed to be added to 175 mL of water in order to make a 0.55 m solution

Recall that molality can be calculated as:

molality=moles solutekg solvent 

We can calculate for the mass of a Na2SO4 using a dimensional analysis with proper conversion and using the molar mass and density provided.

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