Concept explainers
Interpretation:
The number of gold atoms should be calculated in 3.50 g gold.
Concept introduction:
The number of moles of a compound is defined as the ratio of the 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 140A
Explanation of Solution
Mass of gold = 3.50 g
Molar mass of gold = 197 g/mole
Number of moles of gold =
Number of moles of gold =
Since one mole of any substance is equal to the Avogadro number, i.e.,
Number of moles =
Put the values,
Number of atoms of gold =
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