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Chemistry
14 May, 10:16
How many molecules are there in 1 miligram Au?
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Kendall Terry
14 May, 10:19
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30.11 * 10¹⁷ atoms
Explanation:
Given dа ta:
Mass of Au = 1 mg (0.001 g)
Number of molecules / atom = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms, ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 * 10²³ is called Avogadro number.
For example,
Number of moles of Au = mass / molar mass
Number of moles of Au = 0.001 g / 197 g/mol
Number of moles of Au = 5 * 10⁻⁶ mol
Number of atoms:
one mole = 6.022 * 10²³ atoms
5 * 10⁻⁶ mol * 6.022 * 10²³ atoms / 1mol
30.11 * 10¹⁷ atoms
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