   Chapter 3, Problem 10PS

Chapter
Section
Textbook Problem

Balance the following equations:(a) Cr(s) + Cl2(g) → CrCl3(s)(b) SiO2(s) + C(s) → Si(s) + CO(g)(c) Fe(s) + H2O(g) → Fe3O4(s) + H2(g)

(a)

Interpretation Introduction

Interpretation:

The balanced equation should be given.

Concept introduction:

The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, therefore, the number of atoms present in the reactants is equal to the number of atoms present in the products.

Explanation

Chromium reacts with chlorine which yields the Chromium trichloride, the unbalanced equation is given below using correct molecular formula,

Balance the chromium atom in the given equation, when balancing the equation, we should not alter the subscripts and we can change coefficients.  There is one chromium in the right side and one chromium in the left side.  Therefore according to the chromium atom the balanced equation is given below.

Next, balance the chlorine atom in the equation, there are two chlorine atom in the left side and three chlorine atom in right side.  For the balancing the chlorine atom, three molecules of chlorine atom is added to the left side of the reaction to balance the chlorine atoms two molecules of chromium trichloride is added...

(b)

Interpretation Introduction

Interpretation:

The balanced equation should be given.

Concept introduction:

The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, therefore, the number of atoms present in the reactants is equal to the number of atoms present in the products.

(c)

Interpretation Introduction

Interpretation:

The balanced equation should be given.

Concept introduction:

The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, therefore, the number of atoms present in the reactants is equal to the number of atoms present in the products.

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