Interpretation:
Amount of bromine (Br2) in 55 gm of solution 4 has to be calculated.
Concept introduction:
Composition of a solution can be defined by expressing its concentration. Concentration can be expressed either qualitatively or quantitatively. There are several ways by which we can describe the concentration of the solution quantitatively. Some commonly used quantitative descriptions are percent by mass, percent by volume, molarity, molality and mole fraction.
Mass percentage or percent by mass (w/W): The mass percentage of a component of a solution is defined as:
Volume/volume percentage (v/V percent): Percent by volume is expressed as the ratio of the volume of the solute to the total volume of the solution multiplied by 100.
In expression,
Answer to Problem 2STP
Answer is D. 0.2628 gm of bromine (Br2) is present in 55 gm of solution 4.
Mass percentage or percent by mass (w/W): The mass percentage of a component of a solution is defined as:
Data given: Total mass of the solution = 55 gm
Percent by mass = 0.4779
Answer is D.
Reasons for incorrect options:
As it can be seen that mass of bromine calculated from the equation:
So, 0.2628 gm of bromine (Br2) is present in 55 gm of solution 4.
That means other options that is,
a. 3.560 g
b. 0.084 98 g
c. 1.151 g
are not found by this equation, that makes them incorrect.
Explanation of Solution
Mass percentage or percent by mass (w/W): The mass percentage of a component of a solution is defined as:
Data given: Total mass of the solution = 55 gm
Percent by mass = 0.4779
Answer is D.
Reasons for incorrect options:
As it can be seen that mass of bromine calculated from the equation:
So, 0.2628 gm of bromine (Br2) is present in 55 gm of solution 4.
That means other options that is,
a. 3.560 g
b. 0.084 98 g
c. 1.151 g
are not found by this equation, that makes them incorrect.
Chapter 14 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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