(a)
To determine: Use tabulated data to calculate
(a)
Explanation of Solution
For reaction
Enthalpy change
For reaction
For reaction,
(b)
To determine:
Which reactions are exothermic which are endothermic?
(b)
Explanation of Solution
If
Here,
For reaction
Enthalpy change
For reaction
Enthalpy change
For reaction
Enthalpy change
In all reaction,
So, all reactions are exothermic.
(c)
To determine:
In which of the reaction does entropy increases. In which does it decrease? In which does it lay about the same?
(c)
Explanation of Solution
Entropy change of a substance is defined as the measure of randomness.
If number of gaseous atoms in reactant is more than in products, the entropy of the system increases.
If number of gaseous atoms in reactant is less than in products, the entropy of the system decreases.
For reaction.
Number of gaseous atoms in reactant
Number of gaseous atoms in product
Here, number for gaseous atoms remain the same in reactant and product so, entropy will not change but remains same.
For reaction.
Number of gaseous atom in reactant
Number of gaseous atom in product
So, entropy of the reaction decreases.
For reaction,
Number of gaseous atom in reactant
Number of gaseous atom in product
So, entropy of the reaction decreases.
(d)
To determine:
For which reaction do low temperatures favor formation of products?
(d)
Explanation of Solution
For first reaction.
For
For low temperature,
For high temperature,
So, here low temperature favors the formation of products for last two reactions.
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Chapter 12 Solutions
CHEMISTRY F/ENGINEERING STUD.-W/OWLV2
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