Fundamentals of Biochemistry: Life at the Molecular Level 5th Edition

Published by Wiley
ISBN 10: 1118918401
ISBN 13: 978-1-11891-840-1

Chapter 1 - Introduction to the Chemistry of Life - Exercises - Page 22: 19

Answer

$$\begin{aligned} \text { Number of molecules } =3.2 \times 10^{5} \text { molecules } \end{aligned}$$

Work Step by Step

We find: $\begin{aligned} \text { Number of molecules } &=(\text { molar conc. })(\text { volume })(6.022 \times 10^{23} \text {molecules}\cdot\operatorname{mol}^{-1} ) \\ &=\left(1.0 \times 10^{-3} \mathrm{mol} \cdot \mathrm{L}^{-1}\right)\left(5.24 \times 10^{-16} \mathrm{L}\right) \\ &\left(6.022 \times 10^{23} \text { molecules } \cdot \mathrm{mol}^{-1}\right) \\ &=3.2 \times 10^{5} \text { molecules } \end{aligned}$
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