Chapter 11, Problem 11.141MP

Interpretation Introduction

Interpretation:

Given that combustion analysis of $3.0078\text{ g}$ of a compound (digitoxin) containing Carbon, Hydrogen, Oxygen produced $7.0950{\text{ g CO}}_2$ and $2.2668{\text{ g H}}_2\text{O}\text{.}$  Osmotic pressure of the solution of the compound is given.  Molecular formula of the compound (digitoxin) has to be deduced.

Concept Introduction:

In the process of osmosis, the solvent molecules pass through a semi - permeable membrane from less concentrated solution to more concentrated solution.  The pressure that has to be applied to prevent the flow of solvent molecules is called osmotic pressure.  It is expressed as,

$\Pi =MRT$

Where,

$\begin{array}{l}\Pi \text{= osmotic pressure}\\ \text{M}\text{= Molar concentration}\\ \text{R}\text{= Universal gas constant}\\ \text{T}\text{= Temperature}\end{array}$

Molarity or molar concentration is a parameter that is used to express concentration of a solution.  It is expressed as,

$\text{Molarity = }\frac{number\text{ of }molesof\text{ solute}}{volume\text{ of solution in L}}$