The area is 60.2, to find area it's length times width.
Answer:

Explanation:
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In this case, when we want to balance chemical reactions such as in this case, the idea is to equal to number of atoms of each element at each side of the equation according to the lay of conservation of mass, just as shown below:

Because we have four phosphorous and ten oxygen atoms at each side.
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Chlorine is more reactive than argon, because argon is not reactive at all. Chlorine only has to gain 1 valence electron