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Chemistry

10th Edition
Steven S. Zumdahl + 2 others
ISBN: 9781305957404

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BuyFindarrow_forward

Chemistry

10th Edition
Steven S. Zumdahl + 2 others
ISBN: 9781305957404
Textbook Problem

Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative and hypnotic. It is the compound used to make “Mickey Finns” in detective stories.

a. Calculate the molar mass of chloral hydrate.

b. What amount (moles) of C2H3Cl3O2 molecules are in 500.0 g chloral hydrate?

c. What is the mass in grams of 2.0 × 10−2 mole of chloral hydrate?

d. What number of chlorine atoms are in 5.0 g chloral hydrate?

e. What mass of chloral hydrate would contain 1.0 g CI?

f. What is the mass of exactly 500 molecules of chloral hydrate?

(a)

Interpretation Introduction

Interpretation: The answers are to be given for the given options.

Concept introduction: The atomic mass is defined as the sum of number of protons and number of neutrons.

Molar mass of a substance is defined as the mass of the substance in gram of one mole of that compound.

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

The amount of substance containing 12g of pure carbon is called a mole. One mole of atoms always contains 6.022×1023 molecules. The number of molecules in one mole is also called Avogadro’s number.

To determine: The molar mass of chloral hydrate (C2H3Cl3O2) .

Explanation

The atomic weight of carbon (C) is 12.01g/mol .

The atomic weight of oxygen (O) is 16.00g/mol .

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

The atomic weight of chlorine (Cl) is 35.453g/mol .

In compound C2H3Cl3O2 , two carbon, two oxygen, three chlorine and three hydrogen atoms are present. Hence, molar mass of C2H3Cl3O2 is calculated as,

[3(1

(b)

Interpretation Introduction

Interpretation: The answers are to be given for the given options.

Concept introduction: The atomic mass is defined as the sum of number of protons and number of neutrons.

Molar mass of a substance is defined as the mass of the substance in gram of one mole of that compound.

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

The amount of substance containing 12g of pure carbon is called a mole. One mole of atoms always contains 6.022×1023 molecules. The number of molecules in one mole is also called Avogadro’s number.

To determine: The number of moles in 500.00g of C2H3Cl3O2 .

(c)

Interpretation Introduction

Interpretation: The answers are to be given for the given options.

Concept introduction: The atomic mass is defined as the sum of number of protons and number of neutrons.

Molar mass of a substance is defined as the mass of the substance in gram of one mole of that compound.

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

The amount of substance containing 12g of pure carbon is called a mole. One mole of atoms always contains 6.022×1023 molecules. The number of molecules in one mole is also called Avogadro’s number.

To determine: The mass of 2.0×102mol C2H3Cl3O2 .

(d)

Interpretation Introduction

Interpretation: The answers are to be given for the given options.

Concept introduction: The atomic mass is defined as the sum of number of protons and number of neutrons.

Molar mass of a substance is defined as the mass of the substance in gram of one mole of that compound.

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

The amount of substance containing 12g of pure carbon is called a mole. One mole of atoms always contains 6.022×1023 molecules. The number of molecules in one mole is also called Avogadro’s number.

To determine: The number of chlorine (Cl) atoms in 5.00g of C2H3Cl3O2 .

(e)

Interpretation Introduction

Interpretation: The answers are to be given for the given options.

Concept introduction: The atomic mass is defined as the sum of number of protons and number of neutrons.

Molar mass of a substance is defined as the mass of the substance in gram of one mole of that compound.

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

The amount of substance containing 12g of pure carbon is called a mole. One mole of atoms always contains 6.022×1023 molecules. The number of molecules in one mole is also called Avogadro’s number.

To determine: The mass of C2H3Cl3O2 . in 1.00g of Cl .

(f)

Interpretation Introduction

Interpretation: The answers are to be given for the given options.

Concept introduction: The atomic mass is defined as the sum of number of protons and number of neutrons.

Molar mass of a substance is defined as the mass of the substance in gram of one mole of that compound.

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

The amount of substance containing 12g of pure carbon is called a mole. One mole of atoms always contains 6.022×1023 molecules. The number of molecules in one mole is also called Avogadro’s number.

To determine: The mass of exactly 500molecules of C2H3Cl3O2 .

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