When HCl(g) reacts with NH3(g) to form NH4Cl(s) , 176 kJ of energy are evolved for each mole of HCl(g) that reacts. Write a bala
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<u>Answer:</u>
<u>For a:</u> The chemical name and chemical formula formed is sodium nitride and
<u>For b:</u> The chemical name and chemical formula formed is strontium oxide and
<u>For c:</u> The chemical name and chemical formula formed is aluminium chloride and
<u>Explanation:</u>
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
The nomenclature of ionic compounds is given by:
1. Positive is written first.
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
- <u>For a:</u> Sodium and nitrogen:
Sodium is the 11th element of periodic table having electronic configuration of
To form ion, this element will loose 1 electron.
Nitrogen is the 7th element of periodic table having electronic configuration of .
To form ion, this element will gain 3 electrons.
By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.
So, the chemical formula for sodium nitride is
- <u>For b:</u> Oxygen and strontium
Strontium is the 38th element of periodic table having electronic configuration of .
To form ion, this element will loose 2 electrons.
Oxygen is the 8th element of periodic table having electronic configuration of .
To form ion, this element will gain 2 electrons.
By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.
So, the chemical formula for strontium oxide is
- <u>For c:</u> Aluminium and chlorine
Aluminium is the 13th element of periodic table having electronic configuration of
To form ion, this element will loose 3 electrons.
Chlorine is the 17th element of the periodic table having electronic configuration of
To form ion, this element will gain 1 electron.
By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.
So, the chemical formula for aluminium chloride is
a. mol O₂=0.5
b. volume O₂ = 25 cm³
c. i. the total volume of the two reactants = 75 cm³
c. ii. the volume of nitrogen dioxide formed = 50 cm³
<h3>Further explanation</h3>Reaction
2NO(gas) + O₂(gas) ⇒ 2NO₂ (gas)
a.
mol NO = 1
From the equation, mol ratio NO : O₂ = 2 : 1, so mol O₂ :
b.
From Avogadro's hypothesis, at the same temperature and pressure, the ratio of gas volume will be equal to the ratio of gas moles
Because mol ratio NO : O₂ = 2 : 1, so volume O₂ :
c.
i. total volume of reactants : 25 cm³+ 50 cm³=75 cm³
ii. the volume of nitrogen dioxide formed :
mol ratio NO : NO₂ = 2 : 2, so volume NO₂ = volume NO = 50 cm³