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Chem 321 Work Group Set 1: Benzene Mass % & Perchloric Acid Volume Solutions, Study notes of Chemistry

Solutions to work group set 1 questions from a chemistry 321 course. It includes calculations for determining the mass percent of benzene in a solution and the volume of a perchloric acid solution needed to make a certain volume of a 1.00 m solution. It also includes a review topic on the reaction quotient for the reaction between mercury(ii) chloride and hydrogen gas.

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2021/2022

Uploaded on 09/12/2022

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Solutions to Chem 321 Work Group Set 1 Questions
Review Topics
An aqueous solution contains 1.3 ppm benzene (C6H6). What is the mass
percent of benzene in this solution?
1.3 ppm C6H6 means there is 1.3 x 10-6 g C6H6 / g solution
mass % C6H6 is defined as
Therefore,
The density of a 70.5% by mass aqueous solution of perchloric acid is 1.67 g/mL.
How many milliliters of this solution are needed to make 0.250 L of a 1.00 M
solution of perchloric acid?
First calculate the molarity of the perchloric acid solution.
molarity = mol solute / L solution
one liter of concentrated perchloric acid solution weighs
one liter of concentrated perchloric acid solution contains
Therefore,
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Solutions to Chem 321 Work Group Set 1 Questions

Review Topics

An aqueous solution contains 1.3 ppm benzene (C 6 H 6 ). What is the mass percent of benzene in this solution? 1.3 ppm C 6 H 6 means there is 1.3 x 10-6^ g C 6 H 6 / g solution mass % C 6 H 6 is defined as Therefore,

The density of a 70.5% by mass aqueous solution of perchloric acid is 1.67 g/mL. How many milliliters of this solution are needed to make 0.250 L of a 1.00 Msolution of perchloric acid?

First calculate the molarity of the perchloric acid solution. molarity = mol solute / L solution one liter of concentrated perchloric acid solution weighs

one liter of concentrated perchloric acid solution contains

Therefore,

Solutions to Chem 321 Work Group Set 1 Questions

Review Topics

Now apply the dilution formula (M 1 V 1 = M 2 V 2 ) and solve for V 1.

Write an expression for the reaction quotient for the following reaction.

Hg 2 Cl 2 (s) + H 2 (g) º 2Hg(l) + 2Cl-^ (aq) + 2H+(aq)