
Concept explainers
(a)
Interpretation:
The element from carbon and hydrogen that has more mass is to be determined.
Concept Introduction :
The number of moles is defined as the ratio of the weight of the substance to its molar mass. Molar mass is defined as the sum of the average
The formula to calculate number of moles is shown below.
(a)

Answer to Problem 5E
One mole of carbon has more mass than one mole of hydrogen.
Explanation of Solution
The molar mass of hydrogen is
Substitute given mole as
The molar mass of carbon is
Substitute given mole as
The calculated mass value of carbon is greater than hydrogen. Therefore, one mole of carbon has more mass than one mole of hydrogen.
(b)
Interpretation:
The element from iron and aluminium that has more mass is to be determined.
Concept Introduction :
The number of moles is defined as the ratio of the weight of the substance to its molar mass. Molar mass is defined as the sum of the average atomic masses of all the atoms present in the chemical formula of any compound.
The formula to calculate number of moles is shown below.
(b)

Answer to Problem 5E
One mole of iron has more mass than one mole of aluminum.
Explanation of Solution
The molar mass of aluminum is
Substitute given mole as
The molar mass of iron is
Substitute given mole as
The calculated mass value of iron is greater than aluminum. Therefore, one mole of iron has more mass than one mole of aluminum.
(c)
Interpretation:
The element from gold and copper that has more mass is to be determined.
Concept Introduction :
The number of moles is defined as the ratio of the weight of the substance to its molar mass. Molar mass is defined as the sum of the average atomic masses of all the atoms present in the chemical formula of any compound.
The formula to calculate number of moles is shown below.
(c)

Answer to Problem 5E
One mole of gold has more mass than one mole of copper.
Explanation of Solution
The molar mass of copper is
Substitute given mole as
The molar mass of gold is
Substitute given mole as
The calculated mass value of gold is greater than copper. Therefore, one mole of gold has more mass than one mole of copper.
(d)
Interpretation:
The element from gold and carbon that has more mass is to be determined.
Concept Introduction :
The number of moles is defined as the ratio of the weight of the substance to its molar mass. Molar mass is defined as the sum of the average atomic masses of all the atoms present in the chemical formula of any compound.
The formula to calculate number of moles is shown below.
(d)

Answer to Problem 5E
One mole of gold has more mass than five moles of carbon.
Explanation of Solution
The molar mass of carbon is
Substitute given mole as
The molar mass of gold is
Substitute given mole as
The calculated mass value of gold is greater than carbon. Therefore, one mole of gold has more mass than five moles of carbon.
Chapter U4 Solutions
Living By Chemistry: First Edition Textbook
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