   # The empirical formula of styrene is CH; the molar mass of styrene is 104.14 g/mol. What number of H atoms are present in a 2.00-g sample of styrene? ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 5, Problem 137AE
Textbook Problem
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## The empirical formula of styrene is CH; the molar mass of styrene is 104.14 g/mol. What number of H atoms are present in a 2.00-g sample of styrene?

Interpretation Introduction

Interpretation: The empirical formula and the molar mass of styrene is given. The number of hydrogen atoms present in the given amount of a sample of styrene is to be calculated.

Concept introduction: The total number of molecules existing in a compound is depicted by the molecular formula of a compound, whereas the empirical formula of a compound gives the simplest ratio of elements present in a compound.

To determine: The number of hydrogen atoms present in the given amount of a sample of styrene.

### Explanation of Solution

Given

The mass of the given sample of styrene is 2.00g .

Empirical formula of styrene is CH .

Molar mass of the compound is 104.14g/mol .

The steps to determine the molecular formula from the empirical formula are,

• The empirical formula mass is calculated.
• The gram molecular mass of the compound is divided by the empirical formula mass.
• The subscripts within the empirical formula are multiplied by the number obtained in the previous step.
• The chemical formula obtained having new subscript values is the molecular formula of the compound.

The empirical formula mass of a given compound is the total of the atomic masses of the constituent atoms.

The atomic mass of carbon is 12g .

The atomic mass of hydrogen is 1g .

The empirical formula mass of CH =12+1g=13g/mol

The given molar mass value is divided by the calculated empirical formula mass value to obtain a whole number multiple,

Wholenumbermultiple=104.14g/mol13g/mol8

The subscripts of the empirical formula are multiplied by the whole number multiple obtained to get the molecular formula of the given compound,

Molecular formula=(CH)8=C8H8

Formula

The number of moles of a substance is calculated by the formula,

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