   # Chemical Formulas as Conversion Factors (Mass to Mass) How many grams of O are in 2 .5 grams of CO 2 ? ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

#### Solutions

Chapter
Section ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 4, Problem 4.8YT
Textbook Problem
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## Chemical Formulas as Conversion Factors (Mass to Mass)How many grams of O are in 2 .5 grams of CO 2 ?

Interpretation Introduction

Interpretation:

The number of grams of oxygen in the given sample of carbon dioxide is to be calculated.

Concept Introduction:

A chemical formula consists of information where the amount of one or more elements can be known in a given compound. The subscript used in the formulas are integer numbers.

If the subscript is a whole number, it represents the number of moles of the element preceding the subscript. Often, a group of atoms in the parentheses represents the number of moles of atoms within the parentheses.

Molar mass is the mass of any given substance divided by the amount of that substance.

### Explanation of Solution

Given information: 2.5 g of CO2

From the chemical formula of CO2, it can be inferred that 2 moles of oxygen is present in 1 mol of CO2. Conversion between grams and moles can be deduced as follows:

Molar mass of oxygen=16.0 g/molMolar mass of carbon dioxide=1×12.0+2(16.0)=44 g/mol

Molar mass of CO2 is 44 g/mol. Now, using the molar mass of carbon dioxide, grams of carbon dioxide are to be converted to moles of carbon dioxide. Then, using the molar mass of oxygen, conversion to moles of oxygen can be done and finally to grams of oxygen as follows:

grams CO2mol CO2mol Ogram O

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