   # One drop of water from a medicine dropper has a volume of approximately 0 .050 mL ( 1 mL = 1 cm 3 ) . a. Determine the number of water molecules in a drop of water. (The density of water is 1 .0 g/cm 3 ). b. How many H atoms would be present in these molecules? ### 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 40E
Textbook Problem
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## One drop of water from a medicine dropper has a volume of approximately 0 .050 mL  ( 1 mL = 1 cm 3 ) . a. Determine the number of water molecules in a drop of water. (The density of water is 1 .0 g/cm 3 ).b. How many H atoms would be present in these molecules?

Interpretation Introduction

Interpretation:

The number of water molecules in a given drop of water and the number of H atoms present in these molecules are to be determined.

Concept Introduction:

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

A conversion factor is considered a numerical ratio in order to change one unit into another.

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

### Explanation of Solution

a) Number of water molecule in a drop of water

Volume of a drop of water is approximately 0.050mL(1mL=1cm3) and the density of water is 1.0g/cm3.

The molar mass of water (H2O) =18.02g/mol

A conversion factor between moles of H2O and water molecules (H2O) can be obtained with the help of Avogadro’s number and molar mass of water as follows:

0.050cm3×(1g H2O1cm3H2O)×(1molH2O18.02g H2O)×(6.022×1023molecules H2O1mol H2O)=1

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