The answer to each of the following questions is a single digit integer, ranging from 0 to 9. B...

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The answer to each of the following questions is a single digit integer, ranging from 0 to 9.

Borax is represented as \( \mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O} \). How many tetrahedral boron atoms are present in the structure of borax?
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