Concept explainers
Questions 23 to 26: Find the number of moles for each mass of substance given.
a)
b)
c)
d)
e)
f)
(a)
Interpretation:
The number of moles of beryllium in
Concept introduction:
A mole of a substance is defined as the same number of particles of the substance as that present in
Answer to Problem 24E
The number of moles of beryllium in
Explanation of Solution
Mass of beryllium is
The molar mass of the beryllium atom is
The number of moles of a substance is given as,
Where,
•
•
Substitute the value of mass and molar mass of beryllium in the equation (1).
Therefore, the number of moles of beryllium in
The number of moles of beryllium in
(b)
Interpretation:
The number of moles of
Concept introduction:
A mole of a substance is defined as the same number of particles of the substance as that present in
Answer to Problem 24E
The number of moles of
Explanation of Solution
Mass of
The molar mass of the carbon atom is
The molar mass of the hydrogen atom is
The molar mass of the chlorine atom is
The molar mass of compound is the sum of molar mass of individual elements present in it.
Therefore, the molar mass of
Hence, the molar mass of
Where,
•
•
Substitute the value of mass and molar mass of
Therefore, the number of moles of
The number of moles of
(c)
Interpretation:
The number of moles of
Concept introduction:
A mole of a substance is defined as the same number of particles of the substance as that present in
Answer to Problem 24E
The number of moles of
Explanation of Solution
Mass of
The molar mass of the calcium is
The molar mass of the oxygen atom is
The molar mass of the hydrogen atom is
The molar mass of compound is the sum of molar mass of individual elements present in it.
Therefore, the molar mass of
Hence, the molar mass of
The number of moles of a substance is given as,
Where,
•
•
Substitute the value of mass and molar mass of
Therefore, the number of moles of
The number of moles of
(d)
Interpretation:
The number of moles of
Concept introduction:
A mole of a substance is defined as the same number of particles of the substance as that present in
Answer to Problem 24E
The number of moles of
Explanation of Solution
Mass of
The chemical formula of
The molar mass of the cobalt is
The molar mass of the bromine atom is
The molar mass of compound is the sum of molar mass of individual elements present in it.
Therefore, the molar mass of
Hence, the molar mass of
The number of moles of a substance is given as,
Where,
•
•
Substitute the value of mass and molar mass of
Therefore, the number of moles of
The number of moles of
(e)
Interpretation:
The number of moles of ammonium dichromate in
Concept introduction:
A mole of a substance is defined as the same number of particles of the substance as that present in
Answer to Problem 24E
The number of moles of ammonium dichromate in
Explanation of Solution
Mass of ammonium dichromate is
The chemical formula of ammonium dichromate is
The molar mass of the nitrogen atom is
The molar mass of the hydrogen atom is
The molar mass of the chromium atom is
The molar mass of the oxygen atom is
The molar mass of compound is the sum of molar mass of individual elements present in it.
Hence, the molar mass of
The number of moles of a substance is given as,
Where,
•
•
Substitute the value of mass and molar mass of ammonium dichromate in the equation (1).
Therefore, the number of moles of ammonium dichromate in
The number of moles of ammonium dichromate in
(f)
Interpretation:
The number of moles of magnesium perchlorate in
Concept introduction:
A mole of a substance is defined as the same number of particles of the substance as that present in
Answer to Problem 24E
The number of moles of magnesium perchlorate in
Explanation of Solution
The mass of magnesium perchlorate is
The chemical formula of magnesium perchlorate is
The molar mass of the magnesium atom is
The molar mass of the oxygen atom is
The molar mass of the chlorine atom is
The molar mass of compound is the sum of molar mass of individual elements present in it.
Therefore, the molar mass of
Hence, the molar mass of
The number of moles of a substance is given as,
Where,
•
•
Substitute the value of mass and molar mass of
Therefore, the number of moles of magnesium perchlorate in
The number of moles of magnesium perchlorate in
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Chapter 7 Solutions
Owlv2, 1 Term (6 Months) Printed Access Card For Cracolice/peters' Introductory Chemistry: An Active Learning Approach, 6th
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