Respuesta :

the mass of boron present in 30 g of borax is ​1.991×10²⁴

Chemical element boron has the atomic number 5 and the letter B in its symbol. It is an amorphous brown powder and a brittle, black, glossy metalloid in its crystalline form. There may be antioxidant effects of boron. Boron is frequently used to treat vaginal yeast infections and boron insufficiency. Additionally, it is used to treat menstrual cramps, osteoarthritis, osteoporosis, and numerous other ailments, but many of these applications lack strong scientific backing.

Molar mass of B = 10.81g/mol

So, 1 mole of B = 10.81g

and 1 mole = NA= 6.023×10²³

By combining,

10.81g of B = 6.023×10²³ atoms of B thus,

35.76g of B = 6.023×10²³

10.81×35.76

35.76g of B

= 1.991*10²⁴

Learn more about Boron here-

https://brainly.com/question/2790945

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