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Is the synthesis of ozone, #O-3#, from oxygen, #O_2#, an example of an exothermic or endothermic reaction?

Answer 1

#3/2O_2+DeltararrO_3#

The reaction as described is ENDOTHERMIC, and photons striking the dioxygen molecule in the upper atmosphere causes it to occur, i.e.

#O=O+hnurarr2dotO#

#dotO+O_2rarrO=stackrel(+)O-stackrel(-)O#

The balance is in favor of bond-breaking, i.e., the reaction as stated in the introduction, as the first reaction—bond-breaking—is unquestionably endothermic, while the second reaction—bond-making—is exothermic.

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Answer 2

Mateo Aguilar

The synthesis of ozone (O₃) from oxygen (O₂) is an endothermic reaction.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.