Given problem “How many molecules of H 2 O are present in 25.4 g of H 2 O ?” is characterized as what has to be chosen from the given options. Concept Introduction: Using the Avogadro’s number , the relationship between the particles number and the number of moles in a substance can be given. One mole of a substance contains 6.02 x 10 23 particles. Molar mass of a substance gives a relationship between the number of grams and number of moles of that particular substance. The Chemical formula subscript also provides relationship between the number of moles of substance to the number of moles of its individual components present in the substance. All the three above relationship can be put into a single diagram as shown below,

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Chapter 6.5, Problem 1QQ

Interpretation Introduction

Interpretation:

Given problem “How many molecules of H2O are present in 25.4 g of H2O?” is characterized as what has to be chosen from the given options.

Concept Introduction:

Using the Avogadro’s number, the relationship between the particles number and the number of moles in a substance can be given. One mole of a substance contains 6.02 x 1023 particles.

Molar mass of a substance gives a relationship between the number of grams and number of moles of that particular substance.

The Chemical formula subscript also provides relationship between the number of moles of substance to the number of moles of its individual components present in the substance.

All the three above relationship can be put into a single diagram as shown below,

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