(a)
Interpretation: The number of moles and atoms in 5.00 g of Aluminium needs to be determined.
Concept Introduction: The molecular mass of compound is the sum of
(a)
Answer to Problem 52A
Explanation of Solution
Molar mass of Al = 27.0 g/mol
Mass of Al given = 5.00 g
1 mole = 6.022 x 1023atoms
Calculate moles of Al:
Calculate number of atoms:
(b)
Interpretation: The mass and atoms in 0.00250 moles of iron needs to be determined.
Concept Introduction: The molecular mass of compound is the sum of atomic mass of all the atoms present in the given chemical compound. Mole concept is used to calculate the moles, mass, number of atoms and moles of a compound. The relation between these values can be shown as:
(b)
Answer to Problem 52A
Explanation of Solution
Molar mass of Fe = 55.8 g/mol
Moles of Fe given = 0.00250 g
1 mole = 6.022 x 1023atoms
Calculate mass of Fe:
Calculate number of atoms:
(c)
Interpretation: The number of moles and mass in
Concept Introduction: The molecular mass of compound is the sum of atomic mass of all the atoms present in the given chemical compound. Mole concept is used to calculate the moles, mass, number of atoms and moles of a compound. The relation between these values can be shown as:
(c)
Answer to Problem 52A
273 g and 4.3 moles
Explanation of Solution
Molar mass of Cu = 63.5 g/mol
Number of atoms of Cu = 2.6 x 1024atoms
1 mole = 6.022 x 1023atoms
Calculate moles:
Calculate mass of Fe:
(c)
Interpretation: The number of moles and atoms in 0.002500 g of Mg needs to be determined.
Concept Introduction: The molecular mass of compound is the sum of atomic mass of all the atoms present in the given chemical compound. Mole concept is used to calculate the moles, mass, number of atoms and moles of a compound. The relation between these values can be shown as:
(c)
Answer to Problem 52A
Explanation of Solution
Molar mass of Mg = 24.0 g/mol
Mass of Mg given = 0.00250 g
1 mole = 6.022 x 1023atoms
Calculate moles of Mg:
Calculate number of atoms:
(e)
Interpretation: The number of moles and number of atoms in 2.7 x 10-3 moles of Na needs to be determined.
Concept Introduction: The molecular mass of compound is the sum of atomic mass of all the atoms present in the given chemical compound. Mole concept is used to calculate the moles, mass, number of atoms and moles of a compound. The relation between these values can be shown as:
(e)
Answer to Problem 52A
Explanation of Solution
Molar mass of Na = 23.0 g/mol
Moles of Na = 2.7 x 10-3 moles
1 mole = 6.022 x 1023atoms
Calculate mass of Na:
Calculate moles:
(f)
Interpretation: The number of moles and mass of 1.00 x 104atoms of U needs to be determined.
Concept Introduction: The molecular mass of compound is the sum of atomic mass of all the atoms present in the given chemical compound. Mole concept is used to calculate the moles, mass, number of atoms and moles of a compound. The relation between these values can be shown as:
(f)
Answer to Problem 52A
Explanation of Solution
Molar mass of U = 238 g/mol
Number of atoms = 1.00 x 104 atoms
1 mole = 6.022 x 1023atoms
Calculate moles:
Calculate mass of U:
Chapter 6 Solutions
World of Chemistry
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