   Chapter 3, Problem 9PS

Chapter
Section
Textbook Problem

Balance the following equations:(a) Cr(s) + O2(g) → Cr2O3(s)(b) Cu2S(s) + O2(g) → Cu(s) + SO2(g)(c) C6H5CH3(ℓ)+ O2(g) → H2O(ℓ) + CO2(g)

(a)

Interpretation Introduction

Interpretation:

The given equation should be balanced.

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 oxygen which yields the Chromium trioxide and 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 two chromium in the right side and one chromium in the left side.  Therefore according to the chromium atom two molecules of chromium is added to the left side.  Therefore according to the chromium atom the balanced equation is given below.

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

(b)

Interpretation Introduction

Interpretation:

The given equation should be balanced.

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 given equation should be balanced.

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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