   Chapter 3, Problem 104E

Chapter
Section
Textbook Problem

Balance the following equations:a. Cr(s) + S8(s) ⟶ Cr2S3(s)b. NaHCO 3 ( s ) → Heat Na 2 CO 3 ( s )  + CO 2 ( g )  + H 2 O  ( g ) c. KClO 3 ( s ) → Heat KCl ( s )  +O 2 ( g ) d. Eu(s) + HF(g) ⟶ EuF3(s) + H2(g)

(a)

Interpretation Introduction

Interpretation: A balanced form of the given chemical equations is to be stated.

Concept introduction: According to the law of conservation of mass, mass can neither be created nor destroyed. The mass of reactants is equal to the mass of products formed during a chemical process.

To determine: A balanced form of the given chemical equation.

Explanation

According to the law of conservation of mass, mass can neither be created nor destroyed. The mass of reactants is equal to the mass of products formed. Therefore a chemical equation, having lesser number of moles of an element on either side of a reaction, is balanced using appropriate numerical coefficients to satisfy the law of conservation of mass.

The given reaction is,

Cr(s)+S8(s)Cr2S3(s)

Adding the coefficient 2 to Cr balances the number of atoms of chromium present on either side of the reaction. The equation thus obtained is,

2Cr(s)+S8(s)Cr2S3(s)

(b)

Interpretation Introduction

Interpretation: A balanced form of the given chemical equations is to be stated.

Concept introduction: According to the law of conservation of mass, mass can neither be created nor destroyed. The mass of reactants is equal to the mass of products formed during a chemical process.

To determine: A balanced form of the given chemical equation.

(c)

Interpretation Introduction

Interpretation: A balanced form of the given chemical equations is to be stated.

Concept introduction: According to the law of conservation of mass, mass can neither be created nor destroyed. The mass of reactants is equal to the mass of products formed during a chemical process.

To determine: A balanced form of the given chemical equation.

(d)

Interpretation Introduction

Interpretation: A balanced form of the given chemical equations is to be stated.

Concept introduction: According to the law of conservation of mass, mass can neither be created nor destroyed. The mass of reactants is equal to the mass of products formed during a chemical process.

To determine: A balanced form of the given chemical equation.

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