Concept explainers
Dimethylnitrosamine, (CH3)2N2O , is a carcinogenic (cancer-causing) substance that may be formed in foods, beverages, or gastric juices from the reaction of nitrite ion (used as a food preservative) with other substances.
a. What is the molar mass of dimethylnitrosamine?
b. How many moles of (CH3h N20 molecules are present in 250 mg dimethylnitrosamine?
c. What is the mass of 0.050 mole of dimethylnitrosamine?
d. How many atoms of hydrogen are in 1.0 mole of dimethylnitrosamine?
e. What is the mass of 1.0 × 106 molecules of dimethylnitrosamine?
f. What is the mass in grams of one molecule of dimethylnitrosamine?
(a)
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
Explanation of Solution
To determine: The molar mass of Dimethylnitrosamine
The atomic weight of carbon
The atomic weight of oxygen
The atomic weight of hydrogen
The atomic weight of nitrogen
In a compound
The molar mass of
Molar mass is defined as mass of
(b)
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
To determine: The number of moles in
Explanation of Solution
Given
The mass of
The molar mass of
The conversion of milligram
Hence, the conversion of
Formula
The number of moles in
Substitute the values of mass and molar mass of
The number of moles in
Number of moles is calculated by dividing the given mass with the molar mass of that compound.
(c)
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
To determine: The mass of
Explanation of Solution
Given
The moles of
The molar mass of
Formula
The mass of
Substitute the values of moles and molar mass of
The mass of
Mass of molecule is calculated by multiplying the number of moles and molar mass of that molecule.
(d)
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
To determine: The number of hydrogen
Explanation of Solution
Given
The moles of
Since, one mole of
Formula
The number of hydrogen atoms in
Substitute the value of number of moles of
The number of hydrogen
The number of atoms is calculated by multiplying the number of moles with Avogadro’s number.
(e)
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
To determine: The mass of exactly
Explanation of Solution
Given
The total molecules in
The molar mass of
Since one mole of atoms always contains
Formula
The mass of
Substitute the values of moles and molar mass of
The mass of exactly
Mass of molecule is calculated by multiplying the number of moles and molar mass of that molecule.
(f)
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
To determine: The mass of exactly
Explanation of Solution
Given
The total molecules in
The molar mass of
Since one mole of atoms always contains
Formula
The mass of
Substitute the values of moles and molar mass of
The mass of exactly
Mass of molecule is calculated by multiplying the number of moles and molar mass of that molecule.
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