Which of the answer choices correctly explains how the law of conservation of energy is fulfilled during an exothermic reaction?
2 answers:
Answer : The correct option is, In an exothermic reaction, the products have less potential energy than the reactants, so energy is released into the surroundings during the reaction.
Explanation:
Endothermic reaction : It is defined as the chemical reaction in which the energy is absorbed from the surrounding.
In this reaction, the potential energy of the reactant are less than the potential energy of the product.
Exothermic reaction : It is defined as the chemical reaction in which the energy is released into the surrounding.
In this reaction, the potential energy of the reactant are more than the potential energy of the product.
Hence, the correct option is, In an exothermic reaction, the products have less potential energy than the reactants, so energy is released into the surroundings during the reaction.
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Explanation:
Relation between pressure, latent heat of fusion, and change in volume is as follows.
Also,
where, is the difference in specific volumes.
Hence,
As, = 22.0 J/mol K
And, ...... (1)
where, = density of water
= density of ice
M = molar mass of water =
Therefore, using formula in equation (1) we will calculate the volume of fusion as follows.
=
=
Therefore, calculate the required pressure as follows.
=
or, = 145 bar/K
Hence, for change of 1 degree pressure the decrease is 145 bar and for 4.7 degree change dP =
= 681.5 bar
Thus, we can conclude that pressure should be increased by 681.5 bar to cause 4.7 degree change in melting point.