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Atomic and Molecular Masses

Some Basic Concepts of Chemistry

Chemistry

Class 11

Overview

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Basics of Atomic Mass and Molecular Mass

Formula unit mass for $K_{2} C O_{3}$ is :

The modern atomic mass unit is based on the mass of :

Formula unit mass of $N a H C O_{3}$ is :

Complete the table given below:

Element Atomic mass Molecular mass Atomicity number
Chlorine 35.5 71 -
Ozone - 48 3
Sulphur 32 - 8
Nitrogen 14 - 2

Haemoglobin contains $4.6 %$ of iron by mass. If the compound contains a single atom of iron then what is its molar mass in $g m o l^{- 1}$ ?

A solution of 0.640 g of azulene in 100.0 g of benzene boils at $80.2 3^{0} C$ . The boiling point of benzene is $80.1 0^{0} C$ ; the $K_{b}$ is $2.5 3^{0} C / m o l a l$ . What is the molecular weight of azulene?

An atom of an element is 10.1 times heavier than the mass of a carbon atom. What is its mass in a.m.u. ?

Discuss the principle and the method of calculation of the following :
Volumetric method for the determination of molecular mass of acids and bases.

Write true or false for the following statement:
One atomic mass unit is a mass unit equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12.

The sum of masses of the atoms in the molecules is known as :

Atomic and Molecular Masses

Overview

Basics of Atomic Mass and Molecular Mass

Formula unit mass for $K_{2} C O_{3}$ is :

The modern atomic mass unit is based on the mass of :

Formula unit mass of $N a H C O_{3}$ is :

Complete the table given below:

Element Atomic mass Molecular mass Atomicity number
Chlorine 35.5 71 -
Ozone - 48 3
Sulphur 32 - 8
Nitrogen 14 - 2

Haemoglobin contains $4.6 %$ of iron by mass. If the compound contains a single atom of iron then what is its molar mass in $g m o l^{- 1}$ ?

A solution of 0.640 g of azulene in 100.0 g of benzene boils at $80.2 3^{0} C$ . The boiling point of benzene is $80.1 0^{0} C$ ; the $K_{b}$ is $2.5 3^{0} C / m o l a l$ . What is the molecular weight of azulene?

An atom of an element is 10.1 times heavier than the mass of a carbon atom. What is its mass in a.m.u. ?

Discuss the principle and the method of calculation of the following :
Volumetric method for the determination of molecular mass of acids and bases.

Write true or false for the following statement:
One atomic mass unit is a mass unit equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12.

The sum of masses of the atoms in the molecules is known as :

Atomic and Molecular Masses

Overview

Basics of Atomic Mass and Molecular Mass

Formula unit mass for K2​CO3​ is :

The modern atomic mass unit is based on the mass of :

Formula unit mass of NaHCO3​ is :

Complete the table given below: ElementAtomic massMolecular massAtomicity numberChlorine35.571-Ozone-483Sulphur32-8Nitrogen14-2

Haemoglobin contains 4.6% of iron by mass. If the compound contains a single atom of iron then what is its molar mass in g mol−1 ?

A solution of 0.640 g of azulene in 100.0 g of benzene boils at 80.230C. The boiling point of benzene is 80.100C; the Kb​ is 2.530C/molal. What is the molecular weight of azulene?

An atom of an element is 10.1 times heavier than the mass of a carbon atom. What is its mass in a.m.u. ?

Discuss the principle and the method of calculation of the following : Volumetric method for the determination of molecular mass of acids and bases.

Write true or false for the following statement: One atomic mass unit is a mass unit equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12.

The sum of masses of the atoms in the molecules is known as :

Formula unit mass for $K_{2} C O_{3}$ is :

Formula unit mass of $N a H C O_{3}$ is :

Complete the table given below:

Element Atomic mass Molecular mass Atomicity number
Chlorine 35.5 71 -
Ozone - 48 3
Sulphur 32 - 8
Nitrogen 14 - 2

Haemoglobin contains $4.6 %$ of iron by mass. If the compound contains a single atom of iron then what is its molar mass in $g m o l^{- 1}$ ?

A solution of 0.640 g of azulene in 100.0 g of benzene boils at $80.2 3^{0} C$ . The boiling point of benzene is $80.1 0^{0} C$ ; the $K_{b}$ is $2.5 3^{0} C / m o l a l$ . What is the molecular weight of azulene?

Discuss the principle and the method of calculation of the following :
Volumetric method for the determination of molecular mass of acids and bases.

Write true or false for the following statement:
One atomic mass unit is a mass unit equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12.