In the balanced redox reaction: 2 cu(s) + s(s) ® cu2s(s), how many electrons are gained or lost by each copper atom? select one: a. each copper atom gains two (2) electrons. b. each copper atom gains one (1) electron. c. each copper atom loses one (1) electron. d. each copper atom loses two (2) electrons.

Option (c) is the correct answer.

Explanation:

The given reaction equation is as follows.

The oxidation-reduction half reactions will be as follows.

Oxidation :

Reduction:

By balancing the above half reactions, oxidation-half reaction will be as follows.

Whereas reduction-half reaction will remain the same.

Hence, it shows that each copper atom is losing one electron to combine with a sulfur atom.

Therefore, we can conclude that each copper atom loses one (1) electron.

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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.