   # The formula mass of an unknown compound containing only C and H is 70.1 amu. What is its molecular formula? ### 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 32E
Textbook Problem
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## The formula mass of an unknown compound containing only C and H is 70.1 amu. What is its molecular formula?

Interpretation Introduction

Interpretation:

The molecular formula of an unknown compound is to be determined.

Concept Introduction:

The characteristic mass of a compound is considered the formula mass of that compound, which is obtained by adding the atomic masses of all its atoms.

The molecular formula represents the precise number of atoms present in the molecule of a compound, but not their structural arrangement.

The formula mass of a compound in amu is considered numerically equal to the molar mass of that compound in gram/mol.

### Explanation of Solution

Given information: The formula mass of an unknown compound containing only C and H atoms is 70.1amu.

The unknown compound consists of only two elements, carbon (C) and hydrogen (H). The molecular formula of the unknown compound can be written as follows:

(CxHy)n

Here, x represents the number of carbon atoms and y represents the number of hydrogen atoms and n is a number.

Suppose, the value of both x and y is 1.

Now, the equation can be written as follows:

[x(massof C)+y(massof H)]×n=70.1gm/mol[(12gm/mol)+(1gm/mol)]×n=70

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