# Chapter 5, Problem 5.89QP

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### CHEMISTRY: ATOMS FIRST VOL 1 W/CON...

14th Edition
Burdge
ISBN: 9781259327933

#### Solutions

Chapter
Section
FindFindarrow_forward

### CHEMISTRY: ATOMS FIRST VOL 1 W/CON...

14th Edition
Burdge
ISBN: 9781259327933

(a)

Interpretation Introduction

Interpretation:

The percent composition by mass of C, H, and O in cinnamic alcohol and the number of molecules of cinnamic alcohol in the given mass of 1.028 g has to be found.

Concept introduction:

A list of the percent by mass of each element in a compound is known as the compound’s percent composition by mass. Percent composition is calculated by dividing the mass of each element in a unit of the compound by the molecular or formula mass of the compound and then multiplying by 100 percent. Mathematically, the percent composition of an element in a compound is expressed as:

Percent by mass of an element = n×atomicmassofelementmolecularorformulamassofcompound×100%

Where, n is the number of atoms of the element in a molecule.

(b)

Interpretation Introduction

Interpretation:

The percent composition by mass of C, H, and O in cinnamic alcohol and the number of molecules of cinnamic alcohol in the given mass of 1.028 g has to be found.

Concept introduction:

First, calculate the molar mass of cinnamic alcohol to convert the mass given into moles.  Then, multiply the obtained moles by Avogadro’s number to get the answer.

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