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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?
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Chemistry: An Atoms First Approach
2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
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Chapter
Section
BuyFindarrow_forward
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
Empirical formula of styrene is
Molar mass of the compound is
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
The atomic mass of hydrogen is
The empirical formula mass of
The given molar mass value is divided by the calculated empirical formula mass value to obtain a whole number multiple,
The subscripts of the empirical formula are multiplied by the whole number multiple obtained to get the molecular formula of the given compound,
Formula
The number of moles of a substance is calculated by the formula,
Chapter 5 Solutions
Chemistry: An Atoms First Approach
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