A possible reaction of ethane with chlorine is:

CH3CH3 + Cl2 ---> CH3CH2Cl + HCl

This reaction could conceivably occur by the following chain mechanism involving steps [1], [2], [3] and [4]. The chain initiating step(s) is (are):

[1] Cl2 --> 2Cl*
[2] Cl* + CH3CH3 --> HCl + CH3C*H2
[3] CH3C*H2 + Cl2 ---> CH3CH2Cl + Cl*
[4] Cl* + Cl* ---> Cl2

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answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.