Concept explainers
What is the mass of each sample?
a.2.75 mol Fe
b.0.115 mol Al
c.125 mol Si
d.1 Ni atom
Interpretation:
The mass of each sample is to be calculated.
Concept Introduction:
A mole is a unit of amount of substance. It relates the number of particles to the molar mass.
One mole of a substance contains Avogadro’s number that is
It also relates to the molar mass of a substance in grams. One mole of a substance weighs that amount in grams which is equal to its molar mass.
Answer to Problem 48E
a)
b)
c)
d)
Explanation of Solution
a)
The mass of Fe is calculated as follows:
The molar mass of Fe is
Therefore, the mass of Fe is
b)
The mass of Al is calculated as follows:
The molar mass of Al is
Thus, the mass of Al is
c)
The mass of Si is calculated as follows:
The molar mass of Si is
Hence, the mass of Si is
d)
The mass of Ni is calculated as follows:
The molar mass of Ni is
Hence, the mass of Ni is
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