Concept explainers
Interpretation:
The time taken to count one mole of atoms should be calculated when two atoms are counted every second. The calculated time should be compared with the age of earth that is
Concept introduction:
Number of moles of a compound is defined as the ratio of given mass of the compound to the molar or molecular mass of the compound.
The mathematical expression is given by:
Number of moles =
The one mole of any substance is equal to the
Answer to Problem 100A
Time taken to count one mole of atoms =
Explanation of Solution
Since, one mole of any substance is equal to the Avogadro number i.e.
It is given that; two atoms are counted every second.
Therefore, time taken to count one mole of atoms =
=
Now, convert the seconds in year.
Since, 1 second =
Number of seconds in a year =
=
Thus, the time taken to count one mole of atoms =
The age of earth =
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Chemistry: Matter and Change
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