One mole of particles of any substance contains how many particles?
1 answer:
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Please, find the complete question in the picture attached.
Answer:
1. Na₂O
2. AlF₃
3. MgO
4. Ca₃P₂
Explanation:
1. Na⁺ and O²⁻
An ionic compound will be formed when two ions of opposite charge attract each other.
The positive ion is called cation and the negative ion is called anion.
Thus, every ionic compound has a cation and an anion electrostatically bonded.
The ions must combine in a proportion that genders a neutral compound: so you must have as many cations as negative charge has one anion and as many anions as positive charge has one cation.
This is, if the cation has charge +x, there will be x anions, and if the anion has charge -y, there will be y cations.
Simbolically:
As you see, the subscripts for each element in the chemical formula are obtained by the exchage of the charges of the ions.
Then, for Na⁺ and O²⁻, the subscript for Na will be 2 and the subscript for O will be 1; and the formula of the ionic compound formed by this pair ot ions is:
- Na₂O
2. Al³⁺ and F⁻
- The subscript of Al will be 1 (because the F ion has charge 1-, and the subscript of F will be 3 (because the Al ion has charge +3).
Thus the ionic compound formed by this pair of ions is:
- AlF₃
3. Mg²⁺ and S²⁻
- The charge 2+ from Mg atom wil become the subscript 2 of S atom, and the charge 2- will become the subscript 2 of Mg atom:
That results in the formula: Mg₂S₂
Except for some special compounds, the chemical formula is simplified, dividing by the least common denominator. In this case, that means that the two 2 subscripts are simplified to 1, and the final chemical formula for the ionic compound formed by this pair of ions is:
- MgO
4. Ca²⁺ and P³⁻
- The charge 2+ from Ca will become subscript 2 for P and the charge 3- whill become subscript 3 for Ca.
Hence, the ionic compound formed by these two ions is:
- Ca₃P₂
<u>Answer:</u> The chemical equations are given below.
<u>Explanation:</u>
- <u>For a:</u> Fe is heated in an atmosphere of steam.
The chemical equation follows:
By Stoichiometry of the reaction:
3 moles of iron reacts with 4 moles of steam to produce 1 mole of iron (II,III) oxide and 4 moles of hydrogen.
- <u>For b:</u> NaOH is added to a solution of
The chemical equation follows:
By Stoichiometry of the reaction:
1 mole of iron nitrate reacts with 3 moles of sodium hydroxide to produce 1 mole of iron hydroxide and 3 moles of sodium nitrate.
- <u>For c:</u>
is added to an acidic solution of
The chemical equation follows:
By Stoichiometry of the reaction:
10 moles of iron(II) sulfate reacts with 2 moles of potassium permangante and 8 moles of sulfuric acid to produce 5 moles of iron(III) sulfate, 1 mole of potassium sulfate, 2 moles of manganese oxide and 8 moles of water.
- <u>For d:</u> Fe is added to a dilute solution of
The chemical equation follows:
By Stoichiometry of the reaction:
1 mole of iron reacts with 1 mole of sulfuric acid to produce 1 mole of iron sulfate and 1 mole of hydrogen gas.
- <u>For e:</u> A solution of
and
is allowed to stand in air.
The chemical equation follows:
By Stoichiometry of the reaction:
3 moles of iron(II) nitrate reacts with 4 moles of nitric acid to produce 3 moles of iron(III) nitrate, 1 mole of nitric oxide and 1 mole of water.
- <u>For f:</u>
is added to a solution of
The chemical equation follows:
By Stoichiometry of the reaction:
1 mole of iron(II) carbonate reacts with 2 moles of perchloric acid to produce 1 moles of iron(II) perchlorate, 1 mole of carbon dioxide and 1 mole of water.
- <u>For g:</u> Fe is heated in air
The chemical equation follows:
By Stoichiometry of the reaction:
2 moles of iron reacts with 1 mole of oxygen gas to produce 2 moles of iron(II) oxide.
Hence, the chemical equations are given above.