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Concept explainers
(a)
Interpretation:
The balanced equation for the formation of
Concept Introduction:
Balanced equation:
In a chemical equation, the number of atoms or elements that present in both reactant and product sides are equal means this equation is known as balanced equation.
(a)
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Explanation of Solution
Boron nitride is formed with water when, Boron oxide is treated with ammonia.
The balanced equation for this react ion is,
(b)
Interpretation:
Enthalpy change of a reaction of formation of Boron nitride has to be calculated.
Concept Introduction:
Hess's law:
Hess's law state that the different in enthalpy change of reactant to product is known as enthalpy change of a reaction.
The enthalpy change reactant to product is calculated by subtraction of standard enthalpy of formation (SEF) of reactant from SEF product.
(b)
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Explanation of Solution
Given,
Boron nitride is formed with water when, Boron oxide is treated with ammonia.
The balanced equation for this react ion is,
From the standard data, the standard enthalpy of formation of Boron oxide and ammonia are substitute in the below equation we get enthalpy change of a reaction of formation of Boron nitride.
Hence, the enthalpy change of a reaction is
(c)
Interpretation:
The amount of borax is needed to produce
Concept Introduction:
Percentage yield:
Percentage yield is given by,
Mole:
Mole of the solid substance is given by,
(c)
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Explanation of Solution
The balanced equation for this react ion is,
Produce mass of
The amount of borax is needed to produce
Hence, the amount of borax is needed to produce
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Chapter 14 Solutions
Loose Leaf for Chemistry: The Molecular Nature of Matter and Change
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