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Chemistry In Focus

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

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Section
BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 4, Problem 37E
Textbook Problem
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Calculate the number of water molecules ( H 2 O ) in 35.7 g of water.

Interpretation Introduction

Interpretation:

The number of water molecules (H2O) in the given sample of water is to be calculated.

Concept Introduction:

The characteristic mass of a compound is considered to be the formula mass of that compound and it is obtained by adding the atomic masses of all the atoms present in the compound.

A conversion factor is the numerical ratio that is required in order to change one unit into another.

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

Explanation of Solution

Given information: 35.7g of water.

The molar mass of H2O =18.01g/mol

Avogadro’s number =6.022×1023

A conversion factor between grams of H2O and moles of H2O can be obtained with the help of Avogadro’s number as follows:

35

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Chapter 4 Solutions

Chemistry In Focus
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