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insens350 [35]
2 years ago
14

Determine the number of Au atoms found in 5.18 grams of gold.

Chemistry
1 answer:
Agata [3.3K]2 years ago
3 0

Answer:

1.58× 10²² atoms of Au

Explanation:

Given data:

Mass of gold = 5.18 g

Number of atoms of gold = ?

Solution:

First of all we will calculate the number of moles of gold.

Number of moles = mass/molar mass

Number of moles = 5.18 g/196.96 g/mol

Number of moles = 0.0263 mol

Number of atoms:

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.

1 mole = 6.022 × 10²³ atoms of Au

0.0263 mol × 6.022 × 10²³ atoms of Au / 1mol

0.158× 10²³ atoms of Au

1.58× 10²² atoms of Au

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In the net ionic equations, we are not include the spectator ions in the equations.

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(a) The given balanced ionic equation will be,

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The ionic equation in separated aqueous solution will be,

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The net ionic equation will be,

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