   # A standard solution is prepaned for the analysis of fluoxymesterone (C 20 H 29 FO 3 ), an anabolic steroid. A stock solution is first prepaned by dissolving 10.0 mg of fluoxymesterone in enough water to give a total volume of 500.0 mL. A 100.0-µL aliquot (portion) of this solution is diluted to a final volume of 100.0 mL. Calculate the concentration of the final solution in terms of molarity. ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 6, Problem 43E
Textbook Problem
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## A standard solution is prepaned for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepaned by dissolving 10.0 mg of fluoxymesterone in enough water to give a total volume of 500.0 mL. A 100.0-µL aliquot (portion) of this solution is diluted to a final volume of 100.0 mL. Calculate the concentration of the final solution in terms of molarity.

Interpretation Introduction

Interpretation: To find the concentration of stock solution and the concentration of the final solution in terms of molarity.

Concept introduction:

Concentration can be defined in terms of molarity as moles of solute per volume of solution in litres. It can be given by the expression,

Molarity=massofsolutevolumeofsolution

### Explanation of Solution

Explanation

molecular weight of fluoxymesterone =336g/mole

weight of fluoxymesterone=10.0mg

To calculate the moles of fluoxymesterone

We have 10.0mg is divided by fluoxymesterone molecular weight we get mole

mole=weightofsoluteingramsmolecularweightingram/mole

mole=0.0100g336g/mole

2.98×10-5mole

volume in litre =0.500L

To calculate the molarity of stock solution

Molarity=moleofsolutevolumeofsolutionin litre

The calculated moles (from step-1) is dissolved in 500ml which is 0

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