   # A compound composed of iron and carbon monoxide, Fe x (CO) y , is 30.70% iron. What is the empirical formula for the compound? ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 2, Problem 123GQ
Textbook Problem
166 views

## A compound composed of iron and carbon monoxide, Fex(CO)y, is 30.70% iron. What is the empirical formula for the compound?

Interpretation Introduction

Interpretation: The empirical formula of the given compound should be determined.

Concept introduction:

• Empirical formula of a compound represents the smallest whole number relative ratio of elements in that compound.
• Equation for number moles from mass and molar mass,

Numberofmoles=MassingramsMolarmass

• Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.

### Explanation of Solution

Mass percent of iron in the given compound Fex(CO)y is given as 30.70%. The remaining percent occupied carbon monoxide.

So, the mass percent of CO in Fex(CO)y is,10030.70=69.30%

Mass percent of an element means, 100g of compound contains that mass percent of an element in grams. Therefore, mass of  69.30g CO and 30.70 g of Fe are present respectively in 100g of Fex(CO)y.

Equation for number moles from mass and molar mass is,

Numberofmoles=MassingramsMolarmass

Therefore, the number of moles of Fe is,

Numberofmoles=30.70g55.845g/mol=0.5497mol

The number of moles of CO  is,

Numberofmoles=69

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