How many atoms are in a molecule of borax Na2B4O7?

Answer 1

13 atoms are in one molecule of borax but that is surrounded by 10 water of hydration molecules containing 3 atoms each; giving a total of 43 atoms altogether in and around one borax molecule.

Answer 2

Let's count them. The number after the element denotes how many of that element is present in a molecule. So in borax, there's 2 sodium (Na), 4 boron, (B), and 7 oxygen (O). That's 13 atoms in a borax molecule.

HOWEVER: I do not think this was your question. Are you sure you weren't asked how many atoms are in a MOLE of borax? They're different things. A mole is an amount (think like how a dozen is an amount of things, except instead of 12, a mole is 6.022*(10^23) of things). So in this case, a mole of borax means there are 6.022*(10^23) molecules of Na2B4O7 present. And since there are 13 atoms in each molecule, and that many molecules present, the amount of atoms in a mole of Borax is (13 * 6.022E23 = 7.8*(10^24) atoms).

If you're sure your teacher asked for atoms in a molecule, the answer is 13, but I get the feeling you misread.

Answer 3

2