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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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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,
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.