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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

Solution: Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 81.0% Cu and 19.0% Zn by mass has a density of 8760 kg/m3 .What is the molality of Zn in the solid solution?

Solution: Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 81.0% Cu and 19.0% Zn by mass has a density of 8760 kg/m3 .What is the molal

Problem

Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 81.0% Cu and 19.0% Zn by mass has a density of 8760 kg/m3 .

What is the molality of Zn in the solid solution?

Solution

We’re being asked to calculate for the molality of Zn within a particular sample of red brass consisting of 81.0% Cu and 19.0% Zn by mass that has a density of 8760 kg/m3.


When calculating for molality, we use the following equation:

Solid solution → Cu is the solvent

Solute → Zn


We will calculate the molality of the solution using the following steps:

Step 1. Calculate the mass of the solvent (in kg).

Step 2. Calculate the moles of Zinc.

Step 3. Calculate the molality of the solution.



Since we are calculating for the molality, recall the formula:

molality (m) = mol solutekg solvent


Assume that we have 1000g of Brass solution.

Step 1. Calculate the mass of the Cu and Zn (in g).

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