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Bumek [7]
3 years ago
9

Answer the following stoichiometry question:

Chemistry
1 answer:
vagabundo [1.1K]3 years ago
4 0

Answer:

2.86 × 10²⁴ atoms of gold

Explanation:

Given data:

Number of moles of gold = 4.75 mol

Number of atoms = ?

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.

One moles of substance =  6.022 × 10²³ atoms

4.75 moles of gold = 4.75 × 6.022 × 10²³ atoms of gold

28.61 × 10²³ atoms of gold

2.86 × 10²⁴ atoms of gold

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Anything in red is the question
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Answer:

<em />

  • <em>19. C₂H₂, HF, and H₂O₂ are molecular compounds</em>

<em />

  • <em>20. The formula is CuSO₄. 5H₂O</em>

Explanation:

<u><em>Question 19.</em></u>

The three the chemical formulae in red, C₂H₂, HF, and H₂O₂, represent compounds because a compound is the chemical union of two or more atoms of different kind.

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<em></em>

<u><em>Question 20. </em></u>

<em></em>

You can determine the chemical formula using the molar masses of both Copper(II) sulfate and water.

  • Molar mass of copper(II) sulfate: 159.609 g/mol
  • Molar mass of water: 18.015 g/mol

Call n the number of water molecules in the molecular formula:

  • CuSO₄ . nH₂O

The ratio of water to copper(II) sulfate is:

  • n × molar mass of water / molar mass of the compound
  • n × 18.015 / (n × 18.015 + 159.609) = 36%
  • 18.015n = 0.36(18.015n + 159.609)
  • 18.015n = 6.4854n + 57.45924
  • 11.5296n = 57.45924
  • n = 4.9836 ≈ 5

Therefore, the formula of the hydrate contains 5 molecules of water and it is CuSO₄.5H₂O.

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