   Chapter 3, Problem 84E

Chapter
Section
Textbook Problem

Determine the molecular formulas to which the following empirical formulas and molar masses pertain.a. SNH (188.35 g/mol)b. NPC12 (347.64 g/mol)c. CoC4O4 (341.94 g/mol)d. SN (184.32 g/mol)

(a)

Interpretation Introduction

Interpretation: The empirical formula and molar masses for different compounds are given. By using these values, the molecular formula is to be calculated for each of the compound.

Concept introduction: The smallest whole number ratio of atoms in a compound is known as empirical formula.

The formula that gives the number of atoms present in a molecule is known as molecular formula.

To determine: The molecular formula of the compound having empirical formula SNH .

Explanation

Given

The molar mass of SNH is 188.35g/mol .

The atomic mass of sulfur (S) is 32.065g/mol .

The atomic mass of nitrogen (N) is 14.006g/mol .

The atomic mass of hydrogen (H) is 1.008g/mol .

The empirical formula mass of any compound can be calculated by adding of atomic mass of individual atoms present in it.

Hence, the empirical formula mass of SNH is,

(32.065g/mol+14.006g/mol+1.008g/mol)=47.079g/mol

Formula

The molecular formula is calculated by using the formula,

Molecularformula=[Empiricalformula]n

Where,

• n is the ratio of molar mass and empirical formula mass of that compound

(b)

Interpretation Introduction

Interpretation: The empirical formula and molar masses for different compounds are given. By using these values, the molecular formula is to be calculated for each of the compound.

Concept introduction: The smallest whole number ratio of atoms in a compound is known as empirical formula.

The formula that gives the number of atoms present in a molecule is known as molecular formula.

To determine: The molecular formula of the compound having empirical formula NPCl2 .

(c)

Interpretation Introduction

Interpretation: The empirical formula and molar masses for different compounds are given. By using these values, the molecular formula is to be calculated for each of the compound.

Concept introduction: The smallest whole number ratio of atoms in a compound is known as empirical formula.

The formula that gives the number of atoms present in a molecule is known as molecular formula.

To determine: The molecular formula of the compound having empirical formula CoC4O4 .

(d)

Interpretation Introduction

Interpretation: The empirical formula and molar masses for different compounds are given. By using these values, the molecular formula is to be calculated for each of the compound.

Concept introduction: The smallest whole number ratio of atoms in a compound is known as empirical formula.

The formula that gives the number of atoms present in a molecule is known as molecular formula.

To determine: The molecular formula of the compound having empirical formula SN .

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