Chapter 27, Problem 27.AE

Interpretation Introduction

Interpretation:

Number of ethoxy groups are in each molecule has to be calculated.

Answer to Problem 27.AE

There are two ethoxy groups per molecule.

Explanation of Solution

Given

Formula mass of an organic compound = $\text{417g/mol}$

Amount of the sample = $\text{25}\text{.42 mg}$

Amount of Silver iodide produced by the sample = $\text{29}\text{.03mg}$

To calculate: number of ethoxy groups are in each molecule

One mole ethoxy group gives one mol Silver iodide.

$\text{29}\text{.03mg AgI = 0}\text{.12365 mmol}$

The quantity of analysed compound is $\text{25}\text{.42mg/}\left(\text{417g/mol}\right)\text{= 0}\text{.06096}\text{mmol}$.

$\frac{\text{0}\text{.12365}\text{mmol}\text{ethoxy groups}}{\text{0}\text{.06096}\text{mmol}\text{compound}}\text{=2}\text{.03}\text{(two}\text{ethoxy group/molecule)}$

Conclusion

It was found to be there are two ethoxy groups per molecule.