Concept explainers
(a)
Interpretation:
The number of moles of the sample needs to be determined.
Concept Introduction:
Mole is the amount of the substance that contains the same number of particles or atoms or molecules. Molar mass is defined as an average
(a)
Answer to Problem 14A
Moles of Au = 0.133 mol
Explanation of Solution
symbol of gold = Au
mass of Au = 26.2 g
molar mass of Au = 196.966 gmol-1
The calculation of moles is shown below:
(b)
Interpretation:
The number of moles of the sample needs to be determined.
Concept Introduction:
Mole is the amount of the substance that contains the same number of particles or atoms or molecules. Molar mass is defined as an average mass of atoms present in the chemical formula. It is the sum of the atomic masses of all the atoms present in the chemical formula of any compound.
(b)
Answer to Problem 14A
Moles of Ca = 1.035 mol
Explanation of Solution
symbol of calcium = Ca
mass of Ca = 41.5 g
molar mass of Ca = 40.078 gmol-1
The calculation of moles is shown below:
(c)
Interpretation:
The number of moles of the sample needs to be determined.
Concept Introduction:
Mole is the amount of the substance that contains the same number of particles or atoms or molecules. Molar mass is defined as an average mass of atoms present in the chemical formula. It is the sum of the atomic masses of all the atoms present in the chemical formula of any compound.
(c)
Answer to Problem 14A
Moles of Ba = 0.0024 mol
Explanation of Solution
symbol of Barium = Ba
mass of Ba = 335 mg
molar mass of Ba = 137.327 gmol-1
The calculation of moles is shown below:
(d)
Interpretation:
The number of moles of the sample needs to be determined.
Concept Introduction:
Mole is the amount of the substance that contains the same number of particles or atoms or molecules. Molar mass is defined as an average mass of atoms present in the chemical formula. It is the sum of the atomic masses of all the atoms present in the chemical formula of any compound.
(d)
Answer to Problem 14A
Moles of Pd = 1.33×1021 mol
Explanation of Solution
symbol of palladium = Pd
mass of Pd = 1.42 ×1023 g
molar mass of Pd = 106.42 gmol-1
The calculation of moles is shown below:
(e)
Interpretation:
The number of moles of the sample needs to be determined.
Concept Introduction:
Mole is the amount of the substance that contains the same number of particles or atoms or molecules. Molar mass is defined as an average mass of atoms present in the chemical formula. It is the sum of the atomic masses of all the atoms present in the chemical formula of any compound.
(e)
Answer to Problem 14A
Moles of Ni = 5.196×1020 mol
Explanation of Solution
symbol of nickel = Ni
mass of Ni = 3.05×1025 mg
molar mass of Ni = 58.6934 gmol-1
The calculation of moles is shown below:
(f)
Interpretation:
The number of moles of the sample needs to be determined.
Concept Introduction:
Mole is the amount of the substance that contains the same number of particles or atoms or molecules. Molar mass is defined as an average mass of atoms present in the chemical formula. It is the sum of the atomic masses of all the atoms present in the chemical formula of any compound.
(f)
Answer to Problem 14A
Moles of Fe = 8.122 mol
Explanation of Solution
symbol of iron = Fe
mass of Fe = 1.00 lb
molar mass of Fe = 55.845 gmol-1
1 lb = 453.592 g
The calculation of moles is shown below:
(g)
Interpretation:
The number of moles of the sample needs to be determined.
Concept Introduction:
Mole is the amount of the substance that contains the same number of particles or atoms or molecules. Molar mass is defined as an average mass of atoms present in the chemical formula. It is the sum of the atomic masses of all the atoms present in the chemical formula of any compound.
(g)
Answer to Problem 14A
Moles of C = 0.99 mol
Explanation of Solution
symbol of Carbon = C
mass of C = 12.01 g
molar mass of C = 12.0107 gmol-1
The calculation of moles is shown below:
Chapter 6 Solutions
World of Chemistry
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