Concept explainers
Arrange the following substances in order of increasing mass percent of carbon.
a. caffeine. C8H10N4O2
b. sucrose, C12H22O11
c. ethanol, C2H5OH
Interpretation: The compounds
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.
To determine: The arrangement of compounds
Answer to Problem 78E
The increasing order of mass percent of carbon for the compounds
Explanation of Solution
To determine: The percentage composition (by mass) of carbon in the compound
The atomic weight of oxygen
The atomic weight of hydrogen
The atomic weight of nitrogen
The molar mass is the sum of mass of individual atoms present in it. Hence, molar mass of
Formula
The mass percent of element is calculated as,
Substitute the values of mass of carbon and molar mass of
The percentage composition (by mass) of carbon in
The atomic weight of carbon
To determine: The percentage composition (by mass) of carbon in compound
The atomic weight of carbon
The atomic weight of oxygen
The atomic weight of hydrogen
The molar mass is the sum of mass of individual atoms present in it. Hence, molar mass of
Formula
The mass percent of element is calculated as,
Substitute the values of mass of carbon and molar mass of
To determine: The percentage composition (by mass) of carbon in compound
The atomic weight of carbon
The atomic weight of oxygen
The atomic weight of hydrogen
The molar mass is the sum of mass of individual atoms present in it. Hence, molar mass of
Formula
The mass percent of element is calculated as,
Substitute the values of mass of carbon and molar mass of
To determine: The increasing order of mass percent of carbon for the compounds
The mass percent of carbon atom in
The mass percent of carbon atom in
The mass percent of carbon atom in
Hence, the increasing order of mass percent of carbon for the compounds
The percentage composition of any element is calculated by dividing the total mass of that element with molar mass of compound.
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Chapter 3 Solutions
Chemistry (Instructor's)
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