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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

What number of atoms of nitrogen are present in 5.00 g of each of the following?

a. glycine, C2H5O2N

b. magnesium nitride

c. calcium nitrate

d. dinitrogen tetroxide

(a)

Interpretation Introduction

Interpretation: The mass of each compound is given. By using the mass, the number of nitrogen (N) atoms is to be calculated.

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 nitrogen (N) atoms in 5.00g of glycine (C2H5O2N) .

Explanation

Given

The mass of glycine (C2H5O2N)  is 5.00g .

The molar mass of glycine (C2H5O2N) is,

(2×12.01+5×1.008+2×15.999+14.0)g/mol=75.058g/mol

Formula

The number of moles in C2H5O2N is calculated as,

MolesofC2H5O2N=MassofC2H5O2NMolarmassofC2H5O2N

Substitute the values of mass and molar mass of C2H5O2N in above equation,

MolesofC2H5O2N=MassofC2H5O2NMolarmassofC2H5O2N=5

(b)

Interpretation Introduction

Interpretation: The mass of each compound is given. By using the mass, the number of nitrogen (N) atoms is to be calculated.

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 nitrogen (N) atoms in 5.00g of magnesium nitride

(c)

Interpretation Introduction

Interpretation: The mass of each compound is given. By using the mass, the number of nitrogen (N) atoms is to be calculated.

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 nitrogen (N) atoms in 5.00g of calcium nitrate

(d)

Interpretation Introduction

Interpretation: The mass of each compound is given. By using the mass, the number of nitrogen (N) atoms is to be calculated.

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 nitrogen (N) atoms in 5.00g of dinitrogen tetraoxide

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