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If the formula of Borax is Na$$_2$$ B$$_4$$O$$_x$$(OH)$$_y$$ $$\cdot$$ zH$$_2$$O, then x + y + z = _____
Correct Answer: 17
The formula of borax is Na₂B₄O₅(OH)₄ · 8H₂O.
Comparing with Na₂B₄O$$_x$$(OH)$$_y$$ · zH₂O:
$$x = 5$$, $$y = 4$$, $$z = 8$$
$$x + y + z = 5 + 4 + 8 = 17$$
This matches the answer key value of $$\mathbf{17}$$.
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