   Chapter 2.7, Problem 2.10CYU

Chapter
Section
Textbook Problem

Gallium oxide, GaxOy forms when gallium is combine with oxygen. Suppose you allow 1.25 g of gallium (Ga) to react with oxygen and obtain 1.68 g of GaxOy. What is the formula of the product?

Interpretation Introduction

Interpretation:

The empirical formula of the given product GaxOy is to be determined if 1.25g of Ga is react with ozone to form the product.

Concept introduction:

• Empirical formula of a compound represents the smallest whole number relative ratio of elements in that compound.
• Equation for number moles from mass and molar mass,

Numberofmoles=MassingramsMolarmass

Explanation

The mass of the product GaxOy is given that 1.68g.

The mass of the gallium (Ga) in product is given that 1.25g

So, the mass of O in product GaxOy is,

1.68gGaxOy1.25gGa=0.43gO

Equation for number of moles from mass and molar mass is,

Numberofmoles=MassingramsMolarmass

Therefore,

The number of moles of Ga is,

Numberofmoles=1.25g69

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