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In the stratosphere, oxygen (O2) is converted to ozone (O3) by high energy ultraviolet light. When the equation is written and balanced using whole number coefficients, the coefficient of ozone is:

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Answer:

2  

Explanation:

The unbalanced equation is

O₂ ⟶ O₃

You could balance the equation by writing

1½O₂ ⟶ O₃

However, fractions aren't allowed. Multiply each side by 2.

3O₂ ⟶ 2O₃

The coefficient of ozone is 2.

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